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2500HD 8.1L ???

Discussion in 'The Garage' started by Bhintz, Jun 27, 2004.

  1. Bhintz

    Bhintz 1/2 ton status

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    what type of MPG are you getting w/ your 8.1L, and did you do any upgrades that improved it and is it 2wd or 4wd
     
  2. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    FOURWHEELER said they got about 9mpg average with a 4wd HD back when they first came out and recieved one to test out....
     
  3. jac6695

    jac6695 1/2 ton status

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    You might want to read this thread. Some bad comments, but most positive comments. /forums/images/graemlins/thumb.gif
     
  4. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    My teachers burb gets 12 at 65mph and I think 8 at 70mph, cant rememebr if its 2 or 4wd.
     
  5. b55baron

    b55baron Registered Member

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    I've got an '03 Sierra 2500HD Crew Cab with the 8.1, six-speed manual, 4.10 rear-end and 2WD (didn't want IFS). I've been getting 14.5 to 15.0 mpg at 70 mph with the AC on. The only modifications I've made are a K&N air filter and 10W30 Mobil1 oil.

    It still has the original 245/75 R-16 tires. When they wear out, I'm going to try 265's which should get a little better gas mileage.
     
  6. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    With my '01HD 4x4 Regcab Longbed with the 8.1, I got 12 empty, and 6-7 towing. I also have a heavy right foot.

    The best I think I ever got was 14.5 on the h'way.

    Duramax on the other hand, I rountinely get 18-19 with a best of 21mpg. Towing I get 14-15. /forums/images/graemlins/peace.gif


    John
     

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