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402-408 h/c/i gas mileage ?

This is a discussion on 402-408 h/c/i gas mileage ? within the Internal Engine forums, part of the LSx Technical Help Section category; what kind of gas mileage is everyone getting with a 402-408 h/c/i na builds?...

  1. #1
    Junior Member jmdgto's Avatar
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    torrid red
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    402-408 h/c/i gas mileage ?

    what kind of gas mileage is everyone getting with a 402-408 h/c/i na builds?

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    Impounded
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    I think Luos is getting a lil over 20 on the highway with Slowass.

    A4 or m6?

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    Grand Imperial Wizard Sarge's Avatar
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    25mpg cruising at 70mph @1900 rpm.

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    Senior Member mrr23's Avatar
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    dark bowling green
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    in town about 15mpg.

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    Junior Member jmdgto's Avatar
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    torrid red
    2005 gto

    m6. they told me it was getting 17 mpg hwy.

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    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Sarge View Post
    25mpg cruising at 70mph @1900 rpm.
    What about in town?

  7. #7
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Sarge View Post
    25mpg cruising at 70mph @1900 rpm.
    that's not what your getting in your goat is it?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Sarge View Post
    25mpg cruising at 70mph @1900 rpm.
    I don't believe this for a second.
    Unless your 4th gear (you have automatic right?) is .50 rather than the typical .70.
    Even sporting a 3.42 axle ratio, you should be right around 2100RPM at 70MPH.
    Hell, in stock form that car shouldn't have gotten 25MPG highway with the auto.



    Oh, and my 248/254 cammed 402 gets 20MPG on the highway. M6 with 4.11's.

  9. #9
    Member WS6ICK2K's Avatar
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    I think it all depends on the size cam you decide on... neways goodluck with your build let us kno the results.

  10. #10
    Junior Member jmdgto's Avatar
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    torrid red
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    got 26 mpg at 70 mph through a m6. cam 247/251 623/623 . not bad . in town 8 mpg .lol

  11. #11
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by jmdgto View Post
    got 26 mpg at 70 mph through a m6. cam 247/251 623/623 . not bad . in town 8 mpg .lol
    Gears?
    Heads?

  12. #12
    Junior Member jmdgto's Avatar
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    torrid red
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    heads are afr 225 milled to 65cc. stock gto gears for a m6. 3.42 i think. car runs 1800 rpm at 70 mph.
    Last edited by jmdgto; 06-23-2009 at 04:53 AM.

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    LSX whore allbaugh_04's Avatar
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    Quote Originally Posted by Mr. Luos View Post

    Hell, in stock form that car shouldn't have gotten 25MPG highway with the auto.
    I've gotten 25 easily many times in my A4 and best of 27 before the stall.

    Oh, oops, this is for 402/408s my bad

  14. #14
    TJEA Retirement Home Dr.Crash's Avatar
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    mixed driving i get about 16mpg. freeway is about 22mpg


    i've got a semi heavy foot

  15. #15
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Dr.Crash View Post
    mixed driving i get about 16mpg. freeway is about 22mpg


    i've got a semi heavy foot
    No, that sounds about right

    I just figured my mileage out. 100% street driving, no expressway. 12.2 MPG.

    Now, thats driving it hard.

  16. #16
    TJEA Retirement Home Dr.Crash's Avatar
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    Quote Originally Posted by Hi-Po View Post
    No, that sounds about right

    I just figured my mileage out. 100% street driving, no expressway. 12.2 MPG.

    Now, thats driving it hard.
    I got 12 once with 100% street driving i dont think i ever had my foot off the gas

  17. #17
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Dr.Crash View Post
    I got 12 once with 100% street driving i dont think i ever had my foot off the gas
    Thats not un-usual for me. I blame it on.... I was tuning.

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