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Why do i get such bad mpg??

This is a discussion on Why do i get such bad mpg?? within the General Help forums, part of the LSx Technical Help Section category; I have asked almost everyone and they dont understand why i get such terrible gas mileage. here are my mods ...

  1. #1
    Member crapyboy750's Avatar
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    Why do i get such bad mpg??

    I have asked almost everyone and they dont understand why i get such terrible gas mileage.

    here are my mods to see if yall can help me figure it out why my mpg is sooo bad?

    And right now between highway and city driving i get 165 miles to a tank or 13.8 miles a gallon. On 93 supreme.

    Dynatech Supermaxx header system
    Borla ctaback exhaust
    Stage 3 Century racing transmission w/3200 stall
    MTI air lid w/K&N air filter
    Smooth air bellow
    ASP underdrive pully
    BMR track pac TQ arm
    BMR sub frame connectors
    Front and rear BMR sway bar

  2. #2
    let the F-Bodies roll jimmybling31's Avatar
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    Quote Originally Posted by crapyboy750 View Post
    I have asked almost everyone and they dont understand why i get such terrible gas mileage.

    here are my mods to see if yall can help me figure it out why my mpg is sooo bad?

    And right now between highway and city driving i get 165 miles to a tank or 13.8 miles a gallon. On 93 supreme.

    Dynatech Supermaxx header system
    Borla ctaback exhaust
    Stage 3 Century racing transmission w/3200 stall
    MTI air lid w/K&N air filter
    Smooth air bellow
    ASP underdrive pully
    BMR track pac TQ arm
    BMR sub frame connectors
    Front and rear BMR sway bar
    3200 stall seems pretty obvious

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    Member crapyboy750's Avatar
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    Ya i thought the same thing but there are plenty other guys running cams and stalls that get better mpg than me they got like 200-230 a tank.

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    let the F-Bodies roll jimmybling31's Avatar
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    Quote Originally Posted by crapyboy750 View Post
    Ya i thought the same thing but there are plenty other guys running cams and stalls that get better mpg than me they got like 200-230 a tank.
    could be your driving style then. if you take off really hard all the time then i don't see how you could get any gas mileage at all.

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    Member crapyboy750's Avatar
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    Quote Originally Posted by jimmybling31 View Post
    could be your driving style then. if you take off really hard all the time then i don't see how you could get any gas mileage at all.
    i dont when i take off from a stop its no more than 2k rpm.

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    let the F-Bodies roll jimmybling31's Avatar
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    Quote Originally Posted by crapyboy750 View Post
    i dont when i take off from a stop its no more than 2k rpm.
    hmm. i dunno then.

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    wheelin' and dealin' BlueBomber's Avatar
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    Theres another thread on this subject that would suggest new O2 sensors. Apparently they can just "fade" and slowly eat up your mpg from bad readings as they get older. I don't quite have the mods you do and have a different tranny for that matter, but I did notice im getting shittier mpg all the sudden. So maybe look into some new O2 sensors if your still doubtful on the stall being the problem.

    -mike

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    Member adam3566's Avatar
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    Have you done all the obvious so far? Air pressure in tires (30-34 psi) checked your air filter, 02 sensors are a huge difference can be, exhaust leak possibly, MAF sensor, and any extra weight can change your mileage.

  9. #9
    TunedbyFrost.com Tuner Frost's Avatar
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    O2s as mentioned if they have 40K or more on them.

    Also, if you spend a lot of time cruising UNDER lockup speed (ie; around town driving) your mileage is going to suck. Need to get that converter locked up to get any mileage at all.

  10. #10
    Member crapyboy750's Avatar
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    Quote Originally Posted by BlueBomber View Post
    Theres another thread on this subject that would suggest new O2 sensors. Apparently they can just "fade" and slowly eat up your mpg from bad readings as they get older. I don't quite have the mods you do and have a different tranny for that matter, but I did notice im getting shittier mpg all the sudden. So maybe look into some new O2 sensors if your still doubtful on the stall being the problem.

    -mike
    O2 sensors are new.

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