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8.1L owners

Discussion in '1992-Present Chevy & GMC models' started by Bhintz, Jun 26, 2004.

  1. Bhintz

    Bhintz 1/2 ton status

    Joined:
    Mar 28, 2003
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    Location:
    Roswell, Ga
    what type of MPG are you getting w/ your 8.1L, and did you do any upgrades that improved it
     
  2. Highjaxx

    Highjaxx 1/2 ton status

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    Apr 17, 2002
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    Location:
    Austin,Texas
    My mom has one in her Yukon XL, it's averaging 11.2 MPG. None of us that drive it are very easy on it. No upgrades yet, but this thing is pretty quick stock. /forums/images/graemlins/thumb.gif
     
  3. bigchief427

    bigchief427 Registered Member

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    Location:
    martinsville indiana usa
    i've got a standard cab 2500 with the allison and 285 big o xts and around 10 is the best i do BUT who drives a almost 500 cube motor nicely?
     
  4. b55baron

    b55baron Registered Member

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    Location:
    Marietta, Ga
    I've got an '03 Sierra 2500HD crew cab with an 8.1 and the six speed manual. I get 14.5 to 15 mpg on the highway at 70-75 mph and the a/c on. The only thing I've added is a K&N filter. I also run Mobil 1 oil and a PF-1218 filter.
     

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