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Headers/ Gas Mileage

This is a discussion on Headers/ Gas Mileage within the Firebird / WS6 forums, part of the Vehicle Specific category; Hey all, First off its no news that we get poor gas mileage, i'm getting now on average 18-20 mpg ...

  1. #1
    NY Representative Vertiviper's Avatar
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    Red
    99 Trans Am, M6

    Headers/ Gas Mileage

    Hey all,

    First off its no news that we get poor gas mileage, i'm getting now on average 18-20 mpg (not terrible, my old 'stang was gettin 16). I'm gonna be puttin on some LT's in a few weeks, i've heard mixed feeback as far as gas mileage. Some say If i drive the car normally I could gain a mile or so per gallon, others say I'll be putting gas in every two days....

    What does everyone think?

  2. #2
    member since may 2000 nhraformula's Avatar
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    black
    2000 nhra edition formula

    driving style is what could make youre mpg take a shit.
    i didnt notice any worse mpg after headers
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  3. #3
    Story of My Life!! BIG D's SS's Avatar
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    Black, Blue
    07 TBSS, 07 GSXR1000

    I agree driving style makes or breaks gas mileage. With all my mods and 4.10's my mileage only went down a little more in the city but highway mileage wasn't really affected that much.
    3 inch Chambered Catback.

  4. #4
    Detailing + Design third_shift|studios's Avatar
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    Ben Stiller movie.

    are we talking on an LS1? stick or auto....b/c 18-20 on an ls1 sounds like it's tune-up time after the header install

  5. #5
    NY Representative Vertiviper's Avatar
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    Red
    99 Trans Am, M6

    Quote Originally Posted by dipherentdesign
    are we talking on an LS1? stick or auto....b/c 18-20 on an ls1 sounds like it's tune-up time after the header install
    It's a 99 TA M6, not WS6..Magnaflow cb with SLP flowpac............

    City/Hwy average 20mpg

  6. #6
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    primer
    1973 Camaro

    30,000 miles without headers averaged 21.5mpg. 7,100 with headers averaged 21.6. No difference really.
    '73 Plain Jane Camaro, Gen III, T56
    '02 WS6, M6
    All gone but not forgotten

  7. #7
    Junior Member
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    red
    2001 Trans Am WS6

    ive got a 99 ws6 and im doin about 19/20 mpg. its got 100k miles tho

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