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poor mileage deisel

Discussion in 'Trucks and Trailers' started by cut-rite, Jan 6, 2001.

  1. cut-rite

    cut-rite LawnSite Member
    from mid coast,Maine
    Messages: 69

    I have a 97 gmc 1 ton dually 4 spd automatic with the 6.5 turbo and 4.10 gears . It has 45000 miles and a 2-3 yard dump body,I am only getting about 9.5 miles to the gallon (highway 25%load before plowing season) I have changed the filters and checked the obvious. Any suguestions? What shoud I be getting? thanks, brad
     
    cut-rite, Jan 6, 2001
    #1
  2. TLS

    TLS LawnSite Fanatic
    from N&W Philadelphia Suburbs
    Messages: 7,943

    What size tires are you running? This seems low, however the bigger the tire, the less miles traveled and thus less mpg.

     
    TLS, Jan 6, 2001
    #2
  3. John DiMartino

    John DiMartino LawnSite Silver Member
    from Walden,NY
    Messages: 2,555

    Do you have low power?hwta kind of mileage did it used to get?that is a heavy truck and i dont think its all that bad if your foot's in it a lot.My Dad just sold his 94 6.5 turbo ,it was in a shortbox 2wd 94'and had 3.42's.Its best mileage was 15 on the highway,a 350 could get better#'s.
     
    John DiMartino, Jan 6, 2001
    #3
  4. plowking35

    plowking35 LawnSite Bronze Member
    from S.E. CT
    Messages: 1,687

    I have that same truck, and I get around 12-14 mpg depending on the load, and I to have about 45K on it.
    Go to http://www.62-65-dieselpage.com, they are a gm exclusive web site, and someone will know that answer.
    Dino
     
    plowking35, Jan 7, 2001
    #4
  5. cut-rite

    cut-rite LawnSite Member
    from mid coast,Maine
    Messages: 69

    more info- tire size stock 225-75-16 -small for 1 ton .I have only had this truck for 10,000 miles ,mileage has gotten consistently worse from about 12.5 down to present9.5 (same load and conditions). thanks,brad
     
    cut-rite, Jan 7, 2001
    #5
  6. plowking35

    plowking35 LawnSite Bronze Member
    from S.E. CT
    Messages: 1,687

    we changed to p235/85/16
    It lowers rpms at highway speeds.
    Dino
     
    plowking35, Jan 8, 2001
    #6

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