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Mpg....

This is a discussion on Mpg.... within the Open S30 Z Discussions forums, part of the 1st Generation Z (S30) category; Well I just fueled up for the seconed time since have in the car and I got 15 miles per ...


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    Registered User Tim 76' 280Z's Avatar
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    Default Mpg....

    Well I just fueled up for the seconed time since have in the car and I got 15 miles per gallon... Is this good or bad? I would have to ssay its bad.... If so what can i do???

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    Former frequent poster sblake01's Avatar
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    It all has to do with condition and adjustment/operation of the fuel system components. My 78 gets 19-20 city, 24-26 hwy and I've heard of better than that.
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    Car Guy
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    That's exactly what my car gets when I only drive in stop and go traffic and I'm heavy on the thottle and accelerate hard. Highway is about 20 because it's nears 4000 rpm with the 4 speed. You can also do simple things like checking your tire pressure.

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    Tim,
    What is your mix of driving, town vs hwy? Are you running the oxygenated crap gasoline we are getting now? If so, that's costing you about 20% right there.
    Bruce Palmer
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    Gas mileage is relative to the weight of your right foot. The lighter the foot, the higher the numbers.

    Around town, stop sign to stoplight, I get about 12. On the road, it's over 20, and that's with triple Mikuni's suckin' air @ 70+mph.

    If your Z is your get-to-work car, you need to insure all systems are working and adjusted properly, of course. If your Z is a toy, as is mine, then mileage numbers are not necessarily irrelevant, but less important than otherwise would be the case.

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    Prior to the 10% ethanol change, I was getting 20-22 in town, and 30 on the highway. In-town seems to have dropped since the gas change, haven't done any road trips to check since then.
    Arne - Former owner, HLS30-37705, 7/71, 905 Red
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    240Z Elec. Upgrade guy Zs-ondabrain's Avatar
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    Just traveled on a 2400 mile round trip (MSA) Filled up 8 times and kept her around 2800-rpm (80-MPH average) and got about 26-MPG (about 365 miles per tank)

    Now this obviously has to be estimated because I don't run the tank completely dry and have a pretty good idea of how many more miles I can get from the remainder of the tank, before filling her up again. And not knowing when the next decently priced gas station would be on the trip, and had to refill before she hit (E).

    Around town, if I keep my foot off the firewall, which is harder than it sounds, I'd have to say about 20'ish.

    Oh ya, Stock L24, Stock 73' E-88 head, triple 40DCOE Webers on a Cannon Long manifold, stage 2 cam, 6 into1 header, Mallory Unilite dist. and MSD 6A with Mallory ProMaster coil.

    And local gas prices are at $3.60 a gallon
    Last edited by Zs-ondabrain; 04-30-2008 at 09:23 PM.
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    The timing of this thread is great, as I have just done my first MPG test with my 240.

    My exhaust smells very strongly of fuel, and I just replaced my leaking fuel pump so I figured it was about time. I've found that I get about 12-13 mpg. My driving is both city and highway split about 40/60 and I'd say my driving style is "spirited."

    Until this thread, I thought that was pretty bad, but I guess it's okay. I do need to lean out the mixture I think.

    BTW, gas up here is now $3.80/gallon regular.
    Last edited by JonnyRock; 04-30-2008 at 09:18 PM.
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    Definately porportional to the weight of your right foot, I am getting similar numbers (taking into account the gallon unit). I know I could do better, but due to the fact that it is a toy, I sometimes can't help hammering the s--t out of it and consequently have to accept the higher fuel consumption.
    It is cheaper for me to drive my 5.4 (327 cu"?) litre F150 (18" wheels, HD rear end for towing) most of the time.
    BTW fuel here is $1.35 a litre. Not much sympathy for 3.80 a gallon.
    Last edited by Sailor Bob; 05-01-2008 at 04:56 AM.
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    Quote Originally Posted by Sailor Bob View Post
    BTW fuel here is $1.35 a litre.
    3.785411 Litres per gallon(U.S)
    1.00 USD = 1.02022 CAD

    $1.35 CAD / litre * 3.785411 = $5.11 CAD / Gallon (U.S.)

    $5.11 CAD = $5.00631 USD


    $5.01 USD / Gallon = OUCH!!!
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    I filled up my truck on Tuesday at $1.19.3 CDN, today it is at $1.25.9 CDN. In Newfoundland gas prices are always at the upper end of the scale it seems. It's just part of the price you pay for living in that beautiful far corner of the planet.

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    You're makin me blush Ron.
    Where are you located? (don't say Toronto - you have to narrow it down) - I have family in Hagarsville.
    Last edited by Sailor Bob; 05-01-2008 at 09:15 AM.
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    Quote Originally Posted by Sailor Bob View Post
    You're makin me blush Ron.
    Where are you located? (don't say Toronto - you have to narrow it down) - I have family in Hagarsville.
    Windsor, where someone is always doing the math to decide if it's worthwhile to hop across the border to fill up in Detroit. I don't make a special trip, but if I'm going there anyways, I make it a point to fill up on the US side.
    We need to hear from other parts of the world, to truly see the grim reality, of the cost of gasoline.

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    I range anywhere from 16 to 23 MPG.

    Since my 280 is my daily for at least another couple months, most of my driving is in and out of traffic jams, freeways, and surface streets. I drive though all kinds of conditions.

    My average for my recent roadtrip of the Southwest was around 21 MPG.


    .....Now what's this about a fuel change?

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    Quote Originally Posted by geezer View Post
    Windsor, where someone is always doing the math to decide if it's worthwhile to hop across the border to fill up in Detroit. I don't make a special trip, but if I'm going there anyways, I make it a point to fill up on the US side.
    I live 20 minutes from the boarder and work retail, so all day long I hear about how much cheaper gas and everything else is here.

    But as a college student (and simply as an American and traditionally paying lower prices) this gas situation is putting a squeeze on things.
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    I now average around 30 mpg highway, 20s in the city if I keep my foot out of the firewall. I am running an L28ET, T03/04E turbo, Supra 440cc injectors, 20 psi, etc., etc., and a nice aftermarket engine management system. I run 40 degrees of timing at cruise with an AFR of 15:1 and overrun fuel cut (injectors stop fueling on throttle lift).
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    My old tired '73 240 with all the smog stuff AND an auto trans got 22 coming back from MSA. I was impressed.
    The boys have theirs, I got one too. 71 & 73 240Z, 1985 300ZXT

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    i got 26mpg hiway.(4.5 litre gallon) the #s i see here are like hummer mileage.( 12,13mpg) for a vehicle that wieghs only 2400lbs you'd expect over 30mpg. my brother-in-law has a 95 eldorado and he claims 28mpg hiway. don't make sense.
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    I don't know about over 30 but 12-13 tells me something is wrong.
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    For the most part, I baby my car. But only because I've been in too many accidents and have been injured. There is, however, times when I drive the car like it wants to be driven and she still gets about 22-25. It's kind of funny how my toy gets better gas milage than my recent daily driver (my supercharged Bonneville that I just sold). When I do a lot of highway driving, my milage gets a little worse (but not much.) That's because Kharma can't seem to stay under ninety and she's got the 4 speed.
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    6.1 mpg, 3.90 rear for now, 7k rpm as long and as often as possible

    Of course that is at the track. My DD actually gets 20 mpg in town and 24+ on the highway, Chevy 2500 diesel and fuel prices suck. $4.29/gal at the last fill up.

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    Quote Originally Posted by geezer View Post
    Windsor, where someone is always doing the math to decide if it's worthwhile to hop across the border to fill up in Detroit. I don't make a special trip, but if I'm going there anyways, I make it a point to fill up on the US side.
    We need to hear from other parts of the world, to truly see the grim reality, of the cost of gasoline.

    Ahhhhhh Windsor. Home to some very beautiful casinos that my donations helped build, as well as some really beautiful wildlife! You'd be amazed at what they'd do for a looney!


    Oh...back to the thread, hell I don't know. I put in gas, the gauge goes down, I smile when I drive. Nuff said.
    Last edited by Blue Meanie; 05-03-2008 at 04:03 PM.
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    Just finished my first tank after the winter's sleep, and only got 15.4 mpg ('78 280Z). However, I couldn't find anything but 10% ethanol, which cut things a bit. Last year, I was getting around 17 mpg on "real" gasoline, and that was after adding a 3.9 diff, replacing the 3.545 stock unit, so that should have knocked off another 10% or so. Thus, if I could find real gas, and put the 3.54 unit back in, I'd probably get 18 to 19 in the city. I don't do much on the highway with the Z...
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    Mark,
    So what's wrong with burning that good Illinois corn instead of feeding people with it? Farmers are getting more for it and laughing all the way to the bank.

    I think we can all pretty well give up on seeing real gas ever again.

    We just have to live with a 20% hammering on mileage and paying more for the privelege.
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    Yeah, I had a place that sold "real gas" until last fall, but they switched to gasohol this winter. I just filled up at another place that at least doesn't have the "10 percent Ethanol added" sticker on the pumps (which I at least "think" is required if it's gasohol), so I may have found another source for my "drug of choice". We'll see what the mileage on this tank is . There's supposed to be an Ethanol plant going in within about 20 miles of Champaign, and if it does, I'm sure I'll be out of luck sooner than later. And from what I understand, our groundwater aquifer will be depleted at an alarming rate too...

    Oh well.
    Mark Brandyberry
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    cheap gas... here it's 189.9 cents a litre for 91 octane, about 195 cents for 96 octane and the 98 octane is over $2 a litre.

    NZD that is

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    z2b
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    my 78 is getting about 22 mpg driving back and forth to work, 3.58 a gal u.s for the cheap stuff but luckey i work at a motorcycle shop so i get free octain booster

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    If your 78 is stock it will run on 87 octane w/o octane booster.
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    I range anywhere between 18-23mpg in my 77 running 91. I think when I changed my head gasket, it raised the compression because I can't run 87 without it pinging anymore. I figure if I drove it a little nicer I could do better, but this car isn't meant to be driven nice ;-). I am kinda dissapointed that such a small I6 motor can't do much better than 23mpg. That kinda sucks.
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    Quote Originally Posted by Hrududu View Post
    I am kinda dissapointed that such a small I6 motor can't do much better than 23mpg. That kinda sucks.
    Like I said before. L24 with Triple 40DCOE Webers, Mallory unilite, MSD 6A and stage 2 cam with headers gets 26 MPG freeway. Also has a 79' 5-speed and 3:90 diff

    2 years ago, when I had my Stock S.U.'s on, 280ZX dizzy, and same cam and header, I got 27.5 MPG freeway (to MSA 06')

    Most of you guys can thank you local emmisions laws for crappy milage as well.

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    Amen to that, Dave.

    This ethanol myth is helping to ruin our food supply AND reduce fuel economy, all in the name of green. Ludicrous. It's what happens when feelings override fact.

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    somewhere in this thread, I think I was asked what the carb set up was on my Webers.

    Weber 40DCOE 151's
    Aux. Venturi's are......... 45
    Chokes are...................28
    idle jets are...................45 (F4)
    Main jets are................120? F9
    Air correction jets are ...170

    Here ya go,
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    From the last time I put gas in it, I decided I was going to see what I could get out of it by not accelerating as hard and using a higher gear when possible. Managed 20mpg in all the stop and go traffic I drive in! Definitely not as fun when driving like that and it was definitely hard not to get into it at certain times, but I wanted to see the best that I could get out of it in stop and go traffic.

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    So were you to be burning real gas, that could easily be 24ish mpg.....
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    I get around 10 mpg in town (sideways). On the highway at 100 mph I get 28 mpg!
    Jason

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    Quote Originally Posted by Bruce Palmer View Post
    So were you to be burning real gas, that could easily be 24ish mpg.....
    Dunno where you are, but oxygenated gas is only mandated by the Fed between the first day of November and the last day of February. It used to be MTBE, but recently it's all been ethanol.

    According to my careful prosthesis (I track my fuel stops in an excel book), my mileage was affected a lot more by the weight of my foot than the kind of fuel I was using. The standard deviation was a *lot* bigger than the difference between means for each period. My standard deviation was 2.37, while the difference in means for "good gas" period and "bad gas" period was 1.95.

    As a sidenote, I had quite a time tuning the SUs for the oxygenated fuel (it was damned near full rich adjusted). Since the switch back, I've been able to back the mixture down to the recommended spec in the FSM.
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    Registered User Tim 76' 280Z's Avatar
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    Hey thanks 76datsun280z. Gives me an idea of what i should be getting. My mpg should be a little lower cus i have an auto.

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    Quote Originally Posted by Jehannum View Post
    According to my careful prosthesis (I track my fuel stops in an excel book), my mileage was affected a lot more by the weight of my foot than the kind of fuel I was using.
    Your careful artificial limb? Did you mean "prosthesis" or analysis?
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    Quote Originally Posted by JonnyRock View Post
    Your careful artificial limb? Did you mean "prosthesis" or analysis?
    It was a little joke. It comes from this.

    According to my careful prosthesis, you've got the plague!
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  40. #40
    Registered User Jeff G 78's Avatar
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    I just took a ~400 mile trip in my Z and filled it up this morning. I got 25mpg even. 275 miles of that was highway and 50 was cummuting to and from work in rushhour stop and go. While on the trip I checked my odometer and it was amazingly accurate with my 225/50R16 tires. After 50 miles of watching mile markers, it was within a 1/10 of a mile total! My speedo is another story. It reads over 10% high.
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
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    The alphabet begins w/ Z. AndysPlit's Avatar
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    Quote Originally Posted by Jeff G 78 View Post
    I just took a ~400 mile trip in my Z and filled it up this morning. I got 25mpg even. 275 miles of that was highway and 50 was cummuting to and from work in rushhour stop and go. While on the trip I checked my odometer and it was amazingly accurate with my 225/50R16 tires. After 50 miles of watching mile markers, it was within a 1/10 of a mile total! My speedo is another story. It reads over 10% high.
    ...maybe my mileage will improve after a valve adjustment.

    1978 Datsun 280Z (owned since Aug 1997)
    1986 Nissan 300ZX 2+2 (SOLD!)
    1996 Nissan 300ZX 2+2 (daily driver)

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    There are a ton of things that could affect your mileage. Fuel injector spray pattern, air/fuel adjustment, rolling friction (bearings, trans, axle, brakes, etc), wheel alignment, engine wear, gearing... The list goes on and on. My car would probably do much better if I properly adjusted the air/fuel mixture. Right now I have a potentiometer in the water temp circuit to trick the system. I need to adjust the AFM, but it's running well, so I don't want to screw it up.
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
    http://www.classiczcars.com/photopos...00&ppuser=7975
    '74 260Z BRE look-alike crap can for Optima Batteries ChumpCar World Series Racing racing
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    The alphabet begins w/ Z. AndysPlit's Avatar
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    Quote Originally Posted by Jeff G 78 View Post
    There are a ton of things that could affect your mileage. Fuel injector spray pattern, air/fuel adjustment, rolling friction (bearings, trans, axle, brakes, etc), wheel alignment, engine wear, gearing... The list goes on and on. My car would probably do much better if I properly adjusted the air/fuel mixture. Right now I have a potentiometer in the water temp circuit to trick the system. I need to adjust the AFM, but it's running well, so I don't want to screw it up.

    Right, a lot of factors to consider......But you think you can do better than 25 mpg? Damn!

    1978 Datsun 280Z (owned since Aug 1997)
    1986 Nissan 300ZX 2+2 (SOLD!)
    1996 Nissan 300ZX 2+2 (daily driver)

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    Registered User sleepyzzz's Avatar
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    i have worked out of my '74 260 2+2 several times this spring while we had cool weather to enjoy, since i don't have my a c working yet. i am around 220 pounds, and carry a catalog around that weighs 50 pounds, along with samples, other literature and such. as you know, the 2+2 is also heavier.

    i leaned out the round top S U carbs almost to the point of making the car run rough, and the best i could get on hiway mileage was 26 mpg.

    adjusting them just a little richer to give the car a little more power, and it runs much better, i now average 24 mpg. i do push the engine hard thru the gears, and i am sure that is not helping the mpg average, but man i like the sound of the engine running up the rpms. i have checked the speedometer and odometer against my watch and both are very accurate, running a mile a minute.

    all of my smog controll items were removed in the rebuild. new bearings on all of the wheels, along with K & V round filters, and flowmaster muffler. i also swapped the tranny out for a five speed which i really like alot better. everything is new regarding plug wires, plugs, distributor cap, and such, and i don't know of anything else to try.

    i was told by my mechanic that rebuilt the engine and heads to expect close to thirty mpg, but i don't ever think i will come close to that. i also tried both regular and premium gas and can't tell any difference in gas mileage between the two,although the car does perform better with the premium, as most stations around here still offer 93 octane.
    '74 260 2 + 2 trying to get it together
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    '79 280ZX my first one, sold after getting married

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    Former frequent poster sblake01's Avatar
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    Best I ever got in my 78 was 27.8 on a trip to Solvang and back last year. I had cleaned the injectors and decarbonized the engine just prior to the trip.
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    ktm
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    Quote Originally Posted by AndysPlit View Post
    Right, a lot of factors to consider......But you think you can do better than 25 mpg? Damn!
    As stated earlier, I was pushing 30 mpg on the highway in my car with 3.54 rear gears and a 1978 5-speed. My AFRs when cruising are dead nuts on 15:1 and 40 degrees of timing (L28ET, 7.4:1 compression).

    I am now running 3.70s with the Z32 TT 5-speed with a 0.75 OD. I need to replace my speedo with an electric one to figure out my mileage, but I expect similar results, maybe a little lower.
    -Bo

    1972 240z - Not original and still not done.
    "Something wicked this way comes...."

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    Registered User snag point's Avatar
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    The last 3 fill-ups I have been watching the mpg. I've gotten 21, 20, and 19.5
    in town with somewhat carefull driving. (very hard to keep off the foot off the gas)
    -73 240z, 1983 l28 & 5spd, R180 4.11, ZTherapy 71 su's, 3 2 1 header w/2.5 pipe. (This Z responds to 911 calls)
    -72 240z parts car.
    -72 240z As of 9/25/08 I'm fixing up to sell.

  48. #48
    Registered User moritz55's Avatar
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    Here's one for reference point. I just tuned up my 4BL 390cfm Holley after installing a new ignition on my 240z. I also had a new clutch installed last week so my driving has pretty much 50/50 = highway/city and very light on the pedal since I'm breaking in the new clutch. I just topped off the tank after the tune up and got 20.5 MPG ! I'm pleased since so much of my driving was on the low end of the RPM/Torque range below 3000rpm and under 50 MPH. I'm anxious to take it on a small trip and get an better estimate of highway mileage. I'm sure my mileage will deteriorate as I push it more once my clutch is broken in. I included a photo of my engine setup and the specs below. Hope this helps.

    Specs on my Engine:
    - 2.4L E88 Head , P30 Block with Oversized Exhaust Valves (~9.5 : 1 CR)
    - 4BL 390cfm Holley with Arizona Z manifold
    - MSD 6A (pn 6200) Ignition box
    - Mallory Promaster Coil
    - Mallory Unilite Distributor
    - Magnecor 8.5mm Ignition / Plug wires
    - NGK's gapped at .058" -.060" (with the MSD 6A, I get great spark)
    Attached Thumbnails Attached Thumbnails Mpg....-new-msd-5-08-003.jpg  
    Last edited by moritz55; 05-25-2008 at 11:12 AM.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

  49. #49
    1978 280Z (stock) TomoHawk's Avatar
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    I notice a raw fuel smell in the exhaust on my 280Z, and after checking all kinds of things, it ended up being a broken conductor in a spark plug wire!

    I replaced that wire and now there's no fuel smell, the engine idles more smoothly, the fuel gauge moves slower, and I'll figure out the MPG later.

    thxZ
    Drive Responsibly.
    enjoy classic Rock music.

  50. #50
    Registered User cayox's Avatar
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    how can I tell how much mpg im getting in my 280z?
    1978 Datsun 280Z
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    1978 280Z (stock) TomoHawk's Avatar
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    Use the standard method for figuring MPG:

    1. fill the tank, and mark down the starting odometer reading
    2. drive at least 1/2 tank
    3. fill the tank again, and mark down the ending odometer reading
    calculate the difference in miles, and divide by the gas to fill the tank

    read this: wikiHow page
    Last edited by TomoHawk; 05-26-2008 at 02:52 PM.
    Drive Responsibly.
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    Or use the tripmeter. Zero it out when you fill up and then at the next fill up, divide the tripmeter reading by the number of gallons.
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    Registered User Weasel73240Z's Avatar
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    FYI

    After 2 tanks of gas (91 octane), my stock L24 with new ZTherapy SU's is getting an average of 21 MPG. And since I just finally go it on the road after a 7 month restore, my foot is probably a little heavy right now.
    Paul Martin
    1973 240Z HLS30-127623 (10/72)
    4.11 R-180, 79 ZX 5-speed, ZX Distributor, ZTherapy SU's

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    Well, I filled up for the 2nd time (I use 91 and 92 Octane) and put another 208 miles on my 240z, got 20.6 mpg. Still ran about 50/50 Highway versus City. I pushed it a little more, and hit 100+mph on two occasions and did 5-6 quick starts and accelerations having some fun. Anyway it wasn't too bad. Soon I'll go on a 190 mile road trip with ~20miles city, the rest highway, anxious to see how it goes.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

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    i fill up with 87 octane and get 24 to 26 mpg. i have a 73 with stock L24 and newly rebuilt su's.

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    nahurry , that's great! What's your timing set at if you run 87 octane? Can you also advise what percent on average is City vs Highway miles when you achieve 24-26 mpg?

    Many thanks ,
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

  57. #57
    Registered User nahurry's Avatar
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    my timing is 7 degrees B.T.D.C. and i drive mostly highway.

  58. #58
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    Many thanks 'nahurry". With my Mallory Unilite Breakerless Distributor my timing at idle is 15-16 degrees BTDC and at 3000 rpm is at ~38 BTDC. I get some pinging with 87 octane when I tried it. Anyway hope I get as good mileage as you when I take my little road trip in a week.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

  59. #59
    Mid-life Crisis Sailor Bob's Avatar
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    $1.42.8 a litre this week - soon to go up again. Time for postal workers to deal with oil executives - this is grossly offensive.
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    I run 89 octane on my rebuilt P-79/F-54 combo with stock (for now) '72 SU carbs. On the highway with my early 5-speed and 3.9:1 rear end combo I average just a little over 25mpg at around 3700 RPM. I got horrible mileage once when one of my fuel lines on the bottom of the carb developed a pinhole and leaked all over for hundreds of miles. Had to hitchhike on the res to the nearest gas station.

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    I run 87 and after figuring out that I've only been getting 13mpg, I decided to finally tune my SU's a little. So ten minutes under the hood and now I've been getting 18mpg. I plan on pulling out the unisym and really getting things right, and hope to get 20mpg overall. I drive spirited, but never go above 4k rpm and it's about 50/50 highway/city.
    ***PREVIOUSLY OWNED***
    1970 Datsun 240Z
    HLS30-01704
    71,000 Original Miles

    - Jon

  62. #62
    ktm
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    To all with SUs, do yourself a favor and get a Colormetric (?) tube. This will do more to tell you about your "AFRs" than guessing with a Unisyn and fuel adjustments. Better yet, buy an Innovate LM-1 with a wideband O2, temporarily mount the O2 sensor at the tailpipe, and tune to AFRs.
    -Bo

    1972 240z - Not original and still not done.
    "Something wicked this way comes...."

  63. #63
    Do it in a Z Mat M's Avatar
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    Hey Bo, If you PayPal me the $300 (http://www.titanmotorsports.com/lmdiairame.html), I will gladly go buy one of those things. [edit] I would even be willing to lend it out to our NorCal members!!! [/edit]

    Right now, I am getting a calculated 21.7 MPG with the inherited (from my mom) right foot.

    IIRC, I am running 21* advance. Do you remember what we set it to, Jon?
    Last edited by Mat M; 06-09-2008 at 02:29 PM.
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    01/71 HLS30-19724 original 918, 4 speed, ready for the 5 spd swap, and R200 diff from the '81ZX
    08/71 HLS30-41979 multicolored auto, but under the knife - SOLD!!
    81 ZX Grey/blue 5-speed donor car, runs! - SOLD!!
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    Registered User moritz55's Avatar
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    Jonnyrock, your driving style is now similar to mine. Well I just completed a 3rd fill-up. Hoped to get more Highway miles - but anyway put on 198miles and it took 9.5 gals => 20.8 mpg. I did only ~110 miles pure highway and the rest city so not much better than 50/50 highway vs city. This would roughly estimate to be 16 mpg city and 24.5 mpg highway. Hopefully this weekend I can get a pure highway estimate.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

  65. #65
    The alphabet begins w/ Z. AndysPlit's Avatar
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    I've had to change my driving habits due to the rising cost of gas. I know this may have been covered already, but shifting earlier seems to have have bumped up my mpg slightly. Anyone else taking it easy more often on the pedal?

    1978 Datsun 280Z (owned since Aug 1997)
    1986 Nissan 300ZX 2+2 (SOLD!)
    1996 Nissan 300ZX 2+2 (daily driver)

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    Just got done driving 260 miles of only freeway. Averaged about 68mph @ 3800rpm.
    My overall mileage was about 25mpg, if not better! I'm surprised and pleased.

    BTW, I've always found fuel gauge accuracy to be a funny thing. As we all know, they are not accurate. Not by a long shot. And there's actually some behavioral reasoning behind it but that's a different subject for a different thread. Anyway, my gauge sat just-barely-above to on-top-of the half tank hash mark for more than 150 miles! Almost no movement!
    Last edited by JonnyRock; 06-12-2008 at 03:09 AM.
    ***PREVIOUSLY OWNED***
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    - Jon

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    Former frequent poster sblake01's Avatar
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    Every now and then, you have to clean the connections where it plugs into the sender and occaisionally take the sender itself out and clean it up and make sure it's working properly. That seems to help with the accuracy on my cars. The sender is just a thermister that reads based on resistence. The top of the arm that holds the float is like a 'needle' that slides along a row of windings. Sitting in one spot for 150 miles would indicate to me that there's a 'dead spot' in the windings.
    Last edited by sblake01; 06-12-2008 at 05:28 AM.
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    Car Guy
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    Do you guys think it's a good idea to throw bottle of 'fuel injector cleaner' into a full tank of gas every 5000 miles or so?

  69. #69
    Former frequent poster sblake01's Avatar
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    I don't use the 'in tank' type stuff but I do use a cannister type cleaner every 25K miles or so which is a much more complete cleaning and restoration of the injector spray pattern.
    2004 Ford Ranger EDGE Supercab
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    Do it in a Z Mat M's Avatar
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    WOOO HOOOOO!!!

    I just cleared $103 for 22.6 gals of regular!!!

    YEAH!!! Thanks, Chevron!!!!

    OK, this is in my Tundra, but I got over 18 MPG this tank!
    Mat
    AKA MatMan
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    01/71 HLS30-19724 original 918, 4 speed, ready for the 5 spd swap, and R200 diff from the '81ZX
    08/71 HLS30-41979 multicolored auto, but under the knife - SOLD!!
    81 ZX Grey/blue 5-speed donor car, runs! - SOLD!!
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    After July 1st, I will be paying at least $ 1.50 Cad $ for 1 ( yes , one ) litre of regular 87 octane . It will cost me over $180 to fill up my work vans , each tank , about a tank and a half per week . Right now, today , it's at 1.47 . By July 1st our wise Provincial leaders in B.C. will adopt a 2 cent per litre ''Carbon tax '' which they claim will go directly to STOP pollution etc. etc. I know and understand we still have cheap gas in North America , but isn't this the tail that wags the dog ? And yes, our esteemed Premier drives a big white Yukon , what great optics and insight !

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    Mid-life Crisis Sailor Bob's Avatar
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    What a pile of s--t that carbon tax talk is the liberals are talking the same BS in Ottawa. I am thinking they want most Canadians to have a unuseable and unsellable pile of steel in their driveways that cost $30,000 as planters. The outragious price of fuel will has already reduced carbon emissions with out adding a new tax.
    On another matter: I wonder how much George Bush had invested in oil when he went into office? Further, how much does he have now? It would take Sherlock Holmes to track it down I'm sure, but I bet in five years he will be the richest ex president to ever reside in the US of A. It baffles me how he ever got a second term.
    Cali 4/77
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    The alphabet begins w/ Z. AndysPlit's Avatar
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    or the first term.

    1978 Datsun 280Z (owned since Aug 1997)
    1986 Nissan 300ZX 2+2 (SOLD!)
    1996 Nissan 300ZX 2+2 (daily driver)

  74. #74
    Do it in a Z Mat M's Avatar
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    Without getting political, the Bush family has been in oil for generations. That's where their money comes from.

    [edit] Yay! In before the lock![/edit]
    Last edited by Mat M; 06-13-2008 at 10:31 AM.
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    Quote Originally Posted by Sailor Bob View Post
    On another matter: I wonder how much George Bush had invested in oil when he went into office? Further, how much does he have now? It would take Sherlock Holmes to track it down I'm sure, but I bet in five years he will be the richest ex president to ever reside in the US of A. It baffles me how he ever got a second term.
    Oh, he'll be rich, but 'ol GW was a notoriously bad businessman. As evidenced by his track record in the oval office. It's Cheney and his cronies that are making out like bandits. Awarded all the no-bid contracts in Iraq to friends and family.
    ***PREVIOUSLY OWNED***
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    Oil investors are laughing til they crap their pants. A small munber of people are making billions of $$$s off our loss. We are sheep - simply following the path where ever it goes. It is amazing that so many people are aware that they are being ripped off and there is no action taken to regulate oil company's profits.
    Maybe when the cost of all goods rise it will sink in. I live on an island and shipping costs are beginning to be factored into food costs here. For me: I will get through it, but for the lower rung of society it's gonna sting.
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    Default mpg

    my fuel tank sending unit wiring harness is brand new, and my fuel gauge still won't read at the F when full. but when i get to 300 miles i usually have 3 gallons left.
    ______http://www.cardomain.com/id/nahurry1971____________ 3/73- HLS30-151414

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    Quote Originally Posted by nahurry View Post
    my fuel tank sending unit wiring harness is brand new, and my fuel gauge still won't read at the F when full. but when i get to 300 miles i usually have 3 gallons left.
    That works out to 30mpg...
    ***PREVIOUSLY OWNED***
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    Well, I just completed a short trip using 91 octane and went 158 miles (15 city the balance highway). Averaged 24.3 mpg with 6.5 gallons consumed. This also helped me calibrate by fuel gauge as it measured 1/2 Full when I completed this small trip. When the tank is empty I can add 13.5-14gals) so I figure I'll get roughly 325-350 miles range on a full tank. I did run on two interstates so cruised between 65-72 mph with my car running between 2300-2500 rpm. I have a 5spd from an '82ZX and R200 rear end. I estimate if it were pure highway, I'd get around 26 mpg at best given in city I get ~16-17mpg. I was hoping for a bit better but anyway I keep my 4BL 390cfm Holley running 1/8-3/16 turn richer in order to get great smooth acceleration and stable idling when the alternator kicks in (idle 900 rpm --> 840 rpm with Alternator on).

    Specs: 65mph @ 2300 rpm (90 mph @ 3000 rpm) in 5th gear.
    Mallory Unilite Breakerless Distributor
    Mallory Promaster Coil
    MSD 6A (pn 6200) - Ignition
    Timing 16 BTDC @ 900 rpm (42 BTDC @ 3000 rpm)
    NGK plugs - .060 gap.
    Stock L24 Head and Block (Oversized Valves)
    Compression 190-192 psi
    Tires: BFG g-Force Sport 205/60/15 (about 1% oversized vs Stock)
    Inflation: 26psi
    Last edited by moritz55; 06-15-2008 at 07:47 AM.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

  80. #80
    HS130-150591 4/79 zbane's Avatar
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    Default Another possible reason for poor mileage...

    I know that the gas tank from the S130 is different from those on the S30, but this still may be of help.

    I pulled the tank the other day and found a ventilation tube completely disconnected. Apparently it had been off for quite some time, considering the amount of paint that had been eaten off of the surrounding area.
    I must admit that I am pleased to have found the source for a very intermittent smell of raw fuel, and that the car hasn't just caught fire for no apparent reason...

    My point being: poor fuel economy may not be a purely mechanical issue-there may be a connection that is not good, or completely off somewhere beyond view.
    Attached Thumbnails Attached Thumbnails Mpg....-gastank002.jpg   Mpg....-gastank003.jpg   Mpg....-gastank004.jpg  
    David
    _____________________________________
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    This sounds a bit sick, but I'm starting to LIKE the high gas prices. I live in a very deprived area where $10/hr is "good". People don't have the money drive aside from necessities. The roads are DEAD! I ride a bike ~20mi a day so I love it! I'm actually considering buying a motorcycle again because I'll finally feel safe on it.

    Most people who are complaining about gas prices are living in excess anyway. I have no sympathy for someone who it driving a Suburban financed for 84 months, a 30yr no money down mortgage on a house 50mi from work, and maxed out credit cards. Working in cars dealerships my whole life, this describes a majority of SUV/truck buyers. The only people I really feel sorry for are truckers and people in the airline industry. My DD gets 34mpg and was well within what I could afford to buy.

    Yes, these prices are BS. Of course there are some scum bags manipulating the markets, but we've known that for years. I do not think the world can go on with prices this high and soon those people making money will see that also. Mobil is selling off gas stations because they aren't making money. People are putting all their money in their tank (profits of penny's/gal) and not buying the profitable snacks inside. Eventually things will balance out.

    In reality, $4/gal only amounts to a couple hundred more per year. If a couple hundred more per year is that much, then you should seriously look over your budget.

    BTW, watch out for the fuzz!!!!! Less cars on the road mean less cars for tickets. Police budgets are out of wack due to the high cost of gas. That means they're going to have to write MORE tickets for LESS cars. I've seen more speed traps this year than I have since I started driving. You won't be complaining about gas when you get a $250 ticket and your insurance goes up for 3 years!

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    I don't think that is the only people complaining about gas prices. That is a very narrow view. If you are living on $10 an hour you will feel it soon in the supermarkets or for that matter anywhere that you have to pay for a necessity - prices will rise on virtually everything that is in anyway shipped - the truckers and air operators will realize their costs and recoup them out of your pocket (likely with a few dollars profit as well).
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  83. #83
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    Quote Originally Posted by bkelly View Post

    In reality, $4/gal only amounts to a couple hundred more per year. If a couple hundred more per year is that much, then you should seriously look over your budget.

    I seriously doubt it's only a couple extra hundred dollars a year. With costs increasing at a exponential rate, my fuel budget is higher surely more than that after a year. And how about the people that have a long commute to work? Much much more, I say.

    1978 Datsun 280Z (owned since Aug 1997)
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    working as a wholesale sales rep, i travel about a thousand miles per week.
    when i got into this business, i could fill my old sentra up and drive on about $10 to $12 dollars a day. at the current cost of $4 per gallon, on the same amount of fuel, it takes about $50 per day and i pay for my own expenses. my Frontier pickup gets about 26 mpg and i have an appointment with a mechanic to add a new system that adds hydrogen to the engine and he guarantees at least a 25% increase in fuel mileage and up to 30% more horsepower. i figure i can save enough in fuel expense to pay for the unit and instalation in 5 to 6 months, if gas doesn't go any higher. i am not knowledgeable enough to explain the system but if you want to read up on it here is the link.

    http://www.theautoguy.tv/pages/aquatune.asp
    '74 260 2 + 2 trying to get it together
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  85. #85
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    Quote Originally Posted by sleepyzzz View Post
    i have an appointment with a mechanic to add a new system that adds hydrogen to the engine and he guarantees at least a 25% increase in fuel mileage and up to 30% more horsepower.

    Ehhhh...you might want to do some research on that. As I recall, Popular Mechanics tested the 'Aquatune' and found that it didn't work.

    David, were you able to get a quote on having your tank boiled out?
    .


    1971 Datsun 240Z
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  86. #86
    Do it in a Z Mat M's Avatar
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    Maybe even check out Discovery.com and look up mythbusters, too.
    Mat
    AKA MatMan
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    01/71 HLS30-19724 original 918, 4 speed, ready for the 5 spd swap, and R200 diff from the '81ZX
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    81 ZX Grey/blue 5-speed donor car, runs! - SOLD!!
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    Quote Originally Posted by BRE-240Z View Post
    Ehhhh...you might want to do some research on that. As I recall, Popular Mechanics tested the 'Aquatune' and found that it didn't work.

    David, were you able to get a quote on having your tank boiled out?

    and then you read this where a test was done by a Las Vegas TV station and they claim it worked great, but couldn't get Popular Mechanics to even look at their results.

    http://www.kvbc.com/Global/story.asp?S=4129768


    if i could have it installed and see actual results before paying for it, i would do it in a heart beat. but $1350 total price quoted, with new plugs and oxygen sensor, has me afraid to risk the cash, after reading some of the web sites that came up on the google search. thanks for the help.
    '74 260 2 + 2 trying to get it together
    '69 2000 roadster
    '00 Maxima SE for the wife
    '93 300ZX convertible - daughter's car
    '02 Sentra SER-4 -son's car
    '10 Frontier, my work truck
    '88 300ZX SS, my ex
    '79 280ZX my first one, sold after getting married

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    Default '77 280z - getting under 13 mpg

    This car has been in storage for the last 7 years til I bought it and put it in the shop to get it worked on.

    Cleand out Fuel Injectors, replaced spark plugs and wires. Fixed corroded Temp sensor.

    Was told not to worry about ECU and to watch for the next couple of weeks to see how this does. Mechanic said something about Air Flow Control if it does not improved.

    Does that make any sense. Other suggestions?

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    Don't know but if you find out the nature of it I'ld like to know - I also have a 77 and she is very greedy when it come to gas as well.
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    Another vote for around 20mpg. And the one time I tried 87 my car almost had a coronary! The exhaust pipe started banging against the fender well like a hammer from the knocking. I'm lucky I didn't destroy the car. So I immediately pulled over, added a can of octane boost and filled the tank up with 93 right away. I tried this on a 1/4 tank so I could add more 93 if necessary. Why should a car with 9.0 compression need 93 octane?

    2/71 240Z, HLS30-23788. 920 Gold/Black. California car. 5-speed, otherwise all original/paint, stickers & matching #'s. Driven almost daily over my local "road course" along a river. Performing thorough mechanical restoration, using only OEM parts to not ruin the provenance as an "original" car. Please check out my Flickr photostream!
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    Recently did some freeway cruising and managed over 26 mpg the whole trip.
    Silver '76 280Z Daily-Driver - "Lindsey" -- HLS30286119
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  92. #92
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    I finally did my desired day trip this past week. I relocated to New York from Minnesota and drove through the hills of the Pocono's and Catskill regions on just a beautiful day. I traveled 280.4 miles (my tires are 1.0086 oversized so my odometer actually measured 278miles) on all Highway and used 9.76 gals so my 240z averaged 28.7 MPG. I traveled between 60 - 75 mph (2000-2500rpm) in 5th gear using 91 Octane with 10% methanol. I was pretty pleased and enjoyed trip especially since the 240z ran very nice.

    Specs: 65mph @ 2300 rpm (90 mph @ 3000 rpm) in 5th gear.
    Mallory Unilite Breakerless Distributor
    Mallory Promaster Coil
    MSD 6A (pn 6200) - Ignition
    Timing 16 BTDC @ 900 rpm (42 BTDC @ 3000 rpm)
    NGK plugs - .060 gap.
    Holley 4BL 390 cfm carb
    Stock L24 Head and Block
    Compression ~188-192 psi
    Tires: BFG g-Force Sport 205/60/15 (about 1% oversized vs Stock)
    Inflation: 26psi
    Last edited by moritz55; 07-18-2008 at 07:14 AM.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

  93. #93
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    Quote Originally Posted by Zs-ondabrain View Post
    Like I said before. L24 with Triple 40DCOE Webers, Mallory unilite, MSD 6A and stage 2 cam with headers gets 26 MPG freeway. Also has a 79' 5-speed and 3:90 diff


    Dave.
    Hey Dave, My 79 ZX with 5 speed has a 3.90 dif as well. But I notice you say you were turning 2800RPM and averaging "about 80MPH". At 2800 in 5th my car is probably going about 60MPH. Whats with that?
    Last edited by deadflo; 07-18-2008 at 07:29 AM.

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    I think moritz55 meant "ethanol" instead of "methanol". Unless his Z is a top-fuel dragster.

    BTW, I also did a great cruise of the Catskill Area a month ago. 500 miles over 2 days. Have you ever been to the Pepacton Reservoir and Route 30? Just magnificent! I posted several videos on my CarDomain page.
    Last edited by Poindexter; 07-18-2008 at 09:14 AM.

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    Hi guys, sorry for the error. Yes - I meant "ethanol" ..

    To Deadflo's question there were several 5spd 280zx transmissions. This page has the different types. Mine is the FS5W71B version: http://www.zhome.com/ZCMnL/tech/69-8...terDrawing.jpg

    Also go to this web-site : http://www.zhome.com/ and then go down to the: "Index of technical Articles" and click on it. Then go to on the right side of the website: DRIVE TRAIN "Trans/rear end over-all ratios chart" and click on it. You'll see a table to understand your transmission ratio and Rear End. You must have a different 5spd than I do however we have the same RearEnd.

    Hope this helps... Mark.
    Last edited by moritz55; 07-18-2008 at 10:26 AM.
    Regards,

    Mark M. .........
    1973 240z HLS30-124668 (9/72), "Deep Beryl Green-PGV"
    2010 370z JN1AZ4EH3AM503017 (3/10), "Black Cherry-NAG"

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    Well my stock '77 Z made it 140 miles going from Atlatna to Nashville before I had to fill up. Got a whopping 13 mpg. Later checked and am getting 11 mpg in the city.

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    Quote Originally Posted by jthill3 View Post
    Well my stock '77 Z made it 140 miles going from Atlatna to Nashville before I had to fill up. Got a whopping 13 mpg. Later checked and am getting 11 mpg in the city.
    If your '77 is truly stock, then you must have a problem. My '78 gets 17 in the city, and that's with a 3.9 diff instead of the 3.545 that is stock. I could get more in the 18-19 if/when I put the original diff back. And I have a pretty heavy foot...

    Mark
    Mark Brandyberry
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    Hey it's an old thread but I'll reply to it anyway. I've always been pretty OCD about checking mileage (always try to fill from the same pump so car is at same angle, and I always top it to the rim of the filler - easy to do in an early Z).

    Like the Johnny Cash song, "I've been everywhere, man" - and so has my Z.

    When I lived in Germany I typically used:

    Around 8 to 9 liters per 100km on pure Landstrasse driving (rural highway, approximately 90-100km/h or 55-60mph). This works out to about 28mpg US.

    Around 12 to 14 liters per 100km pure city driving (about 17 - 20 mpg US)

    On the Autobahn at slower speeds (120 km/h to 140km/h or 75mph to 87mph) about 10 liters per 100km which is about 24mpg US

    On the Autobahn balls-to-the-wall (200km/h to 220km/h or 125mph to 137mph) about 18 liters per 100km (about 13mpg US). This was the most fun mileage check of all - I'd fill up at one Tankstelle on the Autobahn in the middle of the night with little or no traffic, and drive it floored to the next fill-up several hundred kilometers down the road. Whoooo--EEEEEEEEE!!!

    My usual mix of driving in Europe usually resulted in an average of 11 liters per 100km (about 21 mpg).

    Moved back to the US in 2004 and since then I've been averaging around 23 mpg (I tend to take the car out less in city situations, plus out on the interstate I don't get the chance to drive all that fast anymore). Best tankful in the past few years was 30.1 mpg and that was at a steady 65mph gas station to gas station on an interstate. Worst was 14.5 mpg, all city driving in traffic jams.

    Three things that kill mpg in these older tech cars: short trips, traffic jams and cold weather, especially in combination.

    My Z's setup: 2.8 Liter (not high compression), 5-Speed, ZX electronic ignition, K&N Filters, Z-Therapy Carbs, MSA Cam (fairly mild), 6 into 1 Headers, 2-1/2" Exhaust System with a FlowMaster muffler, Tokico Shocks, Lowering Springs and Antiroll Bars, all suspension and steering rubber replaced with urethane, and 16" Wheels with 225/50-VR16 tires. It's hibernating right now (that reminds me, I've got to go put the trickle charger back on it - had to charge up my Jeep's battery pending installation of a new Alternator yesterday).

    Best wishes,

    John
    Last edited by ZAutobahn; 02-13-2012 at 10:10 AM.

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    Saw some mention here about gas prices. We are paying $2-7 to $2-12 a litre for the lowest octane fuel here, which is 91. If you want the higher octane which is 96, we pay another 10 cents litre.

    Lots of smaller cars on the roads now.

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    Price here in Edmonton is $1.06/litre,wish I could test the fuel consumption but probably another month and a half before she comes out of storage!

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