Thread: gas mileage

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  1. #261 Re: gas mileage 
    GT Level Member BrendanMurphy's Avatar
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    Found out my crappy mileage was caused by the vac line on the fuel regulator being unplugged..... Noticed on torque that the vacuum was sitting at 18 found the line put it back on and went back to 21
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  2. #262  
    Derp RALM's Avatar
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    Quote Originally Posted by Dee23 View Post
    Yes, vacuum leaks can interfere with getting optimum MPG. Vac leaks arent monitored, so the MAF,IAT,IAC, arent reading that extra amount of air so the meterization gets thrown off and also it can be dirty air depending on how bad the leak is bc its not being filtered either by your air filter.

    If i can remember right, I think the Vac PSI should be around 19-22psi but if u do manage to get the VAC gauge just hook it up to the brake booster line. For a easy quick check, use CARB cleaner and spray on all the VAC lines and listen for the change of the idle.
    Come to think of it I need to check and probably clean my air filter. Just changed it about six months ago but I drive a dirt road on a normal basis



    1995 Grand Prix SE 3.1L V6 N/A
    216,000 Miles
    1998 Grand Prix GT 3.8L V6 N/A 211,000 Miles (RIP)

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  3. #263 Re: gas mileage 
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    Im at 23 + in town driving... :-). Not bad for 2000 GT 136,xxx miles
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  4. #264 Re: gas mileage 
    GT Level Member Jtiger360's Avatar
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    I have no ideal. All i know is I fill my tank once and I do not have to get more gas for over 3 weeks and that is on a 3800 v6
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  5. #265  
    GXP Level Member Kolton Lock's Avatar
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    Burned about a half a tank in 4 days with less than 100 miles since it was full...

    Racekar?

    Or P.O.S?
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  6. #266 Re: gas mileage 
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    Quote Originally Posted by Jtiger360 View Post
    I have no ideal. All i know is I fill my tank once and I do not have to get more gas for over 3 weeks and that is on a 3800 v6
    You proly only drive 15 miles a day.

    How many miles since your last oil change ?
    1997 Red GTP 182000 miles stock
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  7. #267 Re: gas mileage 
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    3800 II V6 here. 24-26 mpg range. 30miles everyday through nothing but flat farm country. Burns about $45/week worth of gas. I don't always fill it either.........damn oil prices.
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  8. #268 Re: gas mileage 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    got 13mpg city today lol...
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  9. #269 Re: gas mileage 
    Donating Users Jordan's Avatar
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    Drove 60 miles to Madison today, drove around there for a while, and by the time I got back I think I averaged about 25. Forgot to check when I got home, but it was 24.5 half way back.

    2009 Cobalt SS/TC Coupe |
    Summit White | 131k | ZZP charge pipes, ZZP heat exchanger, ZZP 3" downpipe, HP tuned, Muffler delete, K&N Typhoon intake, dual interceptors, retrofits with switchback halos
    2006 Grand Prix GXP | Black | 95k
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  10. #270 Re: gas mileage 
    GTP Level Member dmahlikGT's Avatar
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    Consistently getting 300-330miles on a full tank doing city driving only.This car even with boost is not bad on gas but its when i get on it and can just watch that needle drop thruout the day lol.
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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  11. #271 Re: gas mileage 
    Killa Bee Scottydoggs's Avatar
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    i got my average up to 16 today driving around town, lots of stop and go. this is since the lim job and new vac lines, it never went higher then 14 tops before.

    2 new o2 sensors may get it back to 18-20 around town???????

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #272 Re: gas mileage 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Maybe?

    I only get 14-15 city in this colder weather. Though my daily miles is normally only 5-6 miles.

    SMGPFC Member #1
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  13. #273 Re: gas mileage 
    GTP Level Member L36 Killer's Avatar
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    getting btwn 19 and 20 MPH highway...
    "SHELLY" GRAND PRIX GT 02. SLP HEADERS & EXHAUST, K&N CAI, BMR REAR SUSPENSION AND STRUT BRACES, 180 T-STAT, AGX STRUTS, EIBACH SPRINGS, OVERKILL PCM, YELLA TERRA 1.7 ROCKERS, GT1 CAM, SEXMAN PORTED & POLISHED HEADS, STAGE 2 PORTED TB
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  14. #274 Re: gas mileage 
    GrandPrix Junkie
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    Quote Originally Posted by bayus2972 View Post
    getting btwn 19 and 20 MPH highway...
    I thought you said it was higher?
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  15. #275 Re: gas mileage 
    Killa Bee Scottydoggs's Avatar
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    14 is the high side of around town, most of the time, (i was getting before the lim job) 10 to 12 was the norm. now if it drops to 12 it comes back up to 15/16. it never did that before.

    and ive read a list someone posted that o2 only last for 60, or 80,000 miles, ( dont know how true that is) i got 225,000 almost and no service records but my own. figure it cant hurt.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #276 Re: gas mileage 
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    Last tank I averaged 24.5mpg calculated (DIC read 25), mixed city highway.
    Over summer I was commuting to downtown milwaukee averaging 55-75. Calculated 28. DIC read 32-33 from the time I left my garage, till the time I parked at work.
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  17. #277 Re: gas mileage 
    GT Level Member Jtiger360's Avatar
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    Quote Originally Posted by GTP in RTP View Post
    You proly only drive 15 miles a day.

    How many miles since your last oil change ?
    I drive about 2-4 miles a day. I am getting an oil chnage next month. I just bought the car a month ago and I have no idea when it was last changed. The change oil light has not turned on yet.
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  18. #278 Re: gas mileage 
    SE Level Member Comanche1959's Avatar
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    2001 Grand Prix 3.8GTP getting 23.4 average country driving. Has always been in that range. Dunno what range is, but when I fill the tank it shows 370 or so miles.

    Steve
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  19. #279 Re: gas mileage 
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    99 buick regal gs with my speed sensor bad, I get about 21-22 driving between 35-55 mph work and back. I have yet to do an accurate test for highway but the computer dances between 27-33 mpg on instant mileage driving between 65-75mph
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  20. #280 Re: gas mileage 
    GTP Level Member tomtom123's Avatar
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    I get around 400 - 450 miles per tank if I do straight highway driving, but that's non stop =P
    if I drive highway with stops and what not, I can get probably 350 - 390 miles.
    City, I get probably around 250 - 310 miles per tank give or take
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