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Gas Mileage

This is a discussion on Gas Mileage within the Firebird / WS6 forums, part of the Vehicle Specific category; Just wondering what you guys get for gas mileage... I'm pretty sure i'm getting 14mpg... I used to get close ...

  1. #1
    Junior Member Jay_dub87's Avatar
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    Gas Mileage

    Just wondering what you guys get for gas mileage...

    I'm pretty sure i'm getting 14mpg... I used to get close to 21 or so... I took it to the shop a few weeks ago and they threw a new fuel filter in it but i'm getting worse mpg now. I checked the code on my car and it says it's running too lean...O2 sensors are fine.

    Keep in mind I have a 2001 LS1... no mods yet. Seems like i'm getting crappy gas mileage...

  2. #2
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    Post any codes you're throwing - thinking if you're throwing any codes for being lean the PCM is adding fuel to try and compensate for it.

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    Senior Member Redphoenix1998's Avatar
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    1998 Pontiac Trans Am

    when I was stock I got nearly 20 mpg

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    Senior Member Bottesini's Avatar
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    2002 Z28 Camaro M6

    Lately with AC running and all kinds of other bad things for gas mileage I have been hitting around 25-28 with almost all highway driving. In town I have not figured it out. I am still having to much fun with the car to get good MPG

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    MANWHORE TEAM suede's Avatar
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    2000 Trans Am WS.6

    Yea in town sucks, its just too much fun, usually ends up about around 20 but setting at 65 the best i have gotten is 35 but average about 31-32. I'm a M6 with some mods like headers, ORY, ported MAF, Volant CAI, and free mods.

  6. #6
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    Quote Originally Posted by Jay_dub87 View Post
    I checked the code on my car and it says it's running too lean...
    I can usually average 16/24 even with my mods. If code(s) are being thrown for a lean condition something else is going on and probably adding fuel.
    A4(3.42)TA Cover/Nittos/Vig 3200/Corsa Catback/FTRA/BMR Boxed SFC, STB, ACLA, APHR/Predator Custom Tune...

  7. #7
    o4goatman
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    red
    04 gto A/T

    are the mileages u guys posting city or highway ?

  8. #8
    Junior Member Jay_dub87's Avatar
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    Mine's a lot of city driving.... 10 miles to work and 10 miles back.

    I just got new tires on it too, but they're the same size as the old ones....

    I'll post the codes tomorrow if I get a chance

  9. #9
    Member Since 1998 Mecinoid's Avatar
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    '98,'00 Bird '03, 14 Vets

    Quote Originally Posted by suede View Post
    Yea in town sucks, its just too much fun, usually ends up about around 20 but setting at 65 the best i have gotten is 35 but average about 31-32. I'm a M6 with some mods like headers, ORY, ported MAF, Volant CAI, and free mods.

    Wow, now that insane !!! 35mpg. The very best I've ever recorded was 29.5mpg. I think I may have broken 30mpg once or twice on really smooth and level highway at 67mph. I just can't drive 65mph.

    I'm not calling BS ... but, that is amazing for a LS1.... However, in my defense I do have 3.73 gears in mine and if he has 3.42 that would make it so technically.

  10. #10
    MANWHORE TEAM suede's Avatar
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    2000 Trans Am WS.6

    yea i still got the stock 3.42 gears, and i drive 45 miles of open flat concrete hiway one way every day for school. I usually set it about 75 but when i checked it i set it at 65 and just enjoyed the ride. Then its oly running around 13 14 hundred RPM. In town is horrible mostly cuz i play with it too much.

  11. #11
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    just bought 99 TA has 31k no mods,
    -city's about 21-23
    -highway is on the high 20's but i dont drive it that hard

  12. #12
    Member ls1speedster's Avatar
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    black
    2002 trans am

    ive got an oxyegen sensor code thrown..anything i can do to help

  13. #13
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    When stock....
    26 MPG around town (light on the pedal) and 31 MPG on the highway.

    Cam, stock gears...
    23 MPG around town and 27.5 MPG on the highway.

    402 LSx with 4.11 gears...
    14-15 MPG around town and 20 MPG on the highway.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

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