2008 hd2500 6.0 gas

Discussion in 'Member Introductions' started by donniehd2500, Apr 23, 2012.

  1. donniehd2500

    donniehd2500 New Member

    Hello everyone I am Donnie from South Carolina. I have is 2008 hd 2500 6.0 gas truck with 40,000 miles and has terrible gas mileage 9-10 mpg..I have always have had chevrolets.I need help with gas mileage without sacrificing any power loss. thanks everyone
  2. ntbush83

    ntbush83 Epic Member 5+ Years ROTM Winner 1000 Posts

    Welcome!! Thats odd because our 07 2500 gets 14-15 highway and 12-13 in town.
  3. Jeremy09LTZCrew

    Jeremy09LTZCrew Epic Member 5+ Years 1000 Posts

    Welcome to the site. Good to have you on here. You'll probably get a lot more hits on your question if you put it in the performance and fuel section further down the forum page. That being said, do you have any other mods? Lift? Tune? Lead foot? What kind of driving do you do? Highway? City? Does it idle a lot? I know most of those things are pretty obvious, but they can add up FAST when it comes to reduced mileage.
  4. Dirty Dog

    Dirty Dog Member 2 Years 500 Posts ROTM Winner

    :sign0016: Welcome to the club and enjoy the site........
  5. donniehd2500

    donniehd2500 New Member

    Thanks guys for the welcome,my truck is a all stock 2008 hd2500 6.0 gas crew cab z-71 with 305/70/16 km2 BFGs.11.8 mpg with bicycle tires 265/75/16.. 10.3 mpg with the bigger 305/70/16. just looking for better realistic gas milage--- 14-16 highway.i can do the intake and exhaust.Even a programmer if there was one that clearly made a difference.I have owned the truck for 2 1/2 years and only put 9000 miles on it because of the gas mileage issue.thanks for all the help
  6. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    We are the Borg. Lift your vehicle and surrender your keys. We will add your biological and technological distinctiveness to our own. Resistance is futile. Erm, I mean ... welcome to GM Truck Club! In addition to exhaust I definitely recommend a custom tune using a programmer. You'll get more out of that than a stock tune from the same programmer...
  7. donyms

    donyms Epic Member 5+ Years ROTM Winner 1000 Posts

    Welcome to the club Donnie, good to have you as part of the team. I agree with the programmer, the exhaust and the intake are the first things people normally do. I got the Edge CS programmer, K&N intake and Magnaflow exhaust and I get 17 and 19 and i can get 20-21 HWY doing 65 with the cruise. :glasses:
  8. Brews

    Brews Rockstar

    Will any of these changes cause an issue with the warranty?

    Nevermind found the thread.
    Last edited: Apr 24, 2012
  9. mfleetwood

    mfleetwood Epic Member 5+ Years ROTM Winner 5000 Posts

  10. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    Welcome to the G M T C !

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