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  1. #1

    Default Thinking about a Duramax

    I am considering getting out of my 6.0L 1500 to upgrade to a Duramax with a crew cab. What I am concerned about is what the current crop of Duramax engines are producing in the real world for fuel mileage. What do you guys get from your trucks? What can I expect from a stock 08 or 09 Duramax? How much benefit would I see from adding a larger diameter exhaust and what would that cost? Also, I saw mention of "regeneration" in a few posts as I was doing research... what is that? Is that the cleaning process for the particulate filter in the exhaust?

    Thanks in advance for any information. I don't know much about diesel trucks (though I have had diesel cars) but I learn quickly so I am looking forward to any advice/help you folks can give me.
    Last edited by Aiblinger; 05-01-2009 at 06:26 AM.


    2009 Silverado 2500HD
    Duramax Z-71
    Crew Cab
    Line-X spray-in liner
    Re-Trax retractable tonneau cover

  2. #2

    Default LMM is a great engine.

    Let me start by saying I would not trade mine for any other truck, I love it. You are kinda getting the facts right.....The Lmm trucks do get a few MPG less than the former D-max's. It is not the engine it is the particulate filter (DPF) that takes the MPG down. When the truck goes into re-Gen it uses around 1-2 gal of fuel to clean out the DPF. This occurs, depending on driving habbits every tank full to a tank and a half. I have talked to quite a few people that have taken the DPF off and they all seen increases in MPG. You will also need a programmer to do this. Not all programmers will do the job, but there are a lot out there that will. PPe or banks are both popular ones. I have not taken mine off yet but I do plan on doing so in the future. The down side is it will void your warranty and may be a vialation where you live.As far as my MPG, Yesterday when I filled ou I did the calculation and I got 16.7 MPG. When I drove to Wisconson last month I got 18.6.. I think that could of been better but I drove through downtown Chacaigo for about 45 min. Now when I pull my trailer I think I am getting around 14.5-15.6 MPG. I also seen a 1 MPG increase after my first oil change when I switched to AMSOIL 5W-40.
    2008 GMC Sierra 2500HD Ex. Cab, Fire Red, 6.6L Duramax LMM Equipped with UTG Rocker Pods


    AMSOIL is the only oil company that...,"Recommends 25,000 mile oil changes","Gives up to four times better wear protection","Warranties your engine against oil related failure"

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  3. #3

    Default

    I have a 2008 Silverado 3500HD, brought it home in Nov 07, and just turned 2600 miles. Bought mainly for towing an 18' flat bed trailer and 20' gooseneck cattle trailer. Daily driving a 1990 Silverado with a 454. For the Duramax no highway driving yet, best mileage so far was 15.75 mpg (this was the only fill up without any trailering). Worst so far 10.45 mpg.

  4. #4

    Default

    Here is another question for you guys: Is STABILITRAK available on Duramax equipped trucks? I am looking at a couple trucks online and they don't have it. Do you trucks have stabilitrak?

    Thanks for all the input so far, everyone!


    2009 Silverado 2500HD
    Duramax Z-71
    Crew Cab
    Line-X spray-in liner
    Re-Trax retractable tonneau cover

  5. #5

    Default

    My 2008 3500 HD doesn't have stabilitrak. Almost positive it wasn't even an option. Looks like for 2009 it is standard on all 1500 V-8's and an option on 2500 ext cab/crew cab.

  6. #6

    Default

    That would not be an option on a 4WD, I don't think.
    2008 GMC Sierra 2500HD Ex. Cab, Fire Red, 6.6L Duramax LMM Equipped with UTG Rocker Pods


    AMSOIL is the only oil company that...,"Recommends 25,000 mile oil changes","Gives up to four times better wear protection","Warranties your engine against oil related failure"

    Preferred Customers Save up to 30% Click here!!!
    Executive Direct Jobber ZO# 1695636
    Scott Douglass 248-721-1002
    Order online:
    www.1st-synthetics.com




  7. #7

    Default

    my '07 VortecMAX has Stabilitrak and it is 4WD... hmm... I will do some more research. Thanks guys!


    2009 Silverado 2500HD
    Duramax Z-71
    Crew Cab
    Line-X spray-in liner
    Re-Trax retractable tonneau cover

  8. #8
    Moderator
    dwill3015's Avatar
    Join Date
    Jan 2007
    Location
    Yacolt, Washington
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    Default

    Good luck on your search!
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  9. #9
    Sr. Engineer nickgiacalone's Avatar
    Join Date
    Mar 2009
    Location
    Metro Detroit, MI
    Posts
    302

    Default

    Quote Originally Posted by 1st Synthetics View Post
    That would not be an option on a 4WD, I don't think.
    I know for the most part this conversation is regarding diesel trucks but my 09 2500hd ext cab 6.0 gas does have traction control and stabilitrac and is a 4wd.
    -Nick
    2013 Silverado 1500 4x4 LT, Z71 Appearance Package, Vortec 5.3L AFM
    Victory Red, Ebony Cloth
    Custom pin striping, Bed Rail Protectors, GM Bed Liner, Husky Liner Floor Liners, Tint, Wade In-Channel Window Visors, Tractor Supply Black Low Profile Toolbox


  10. #10

    Default Bump

    Thanks for all the info, everyone! I am still hoping for more input regarding 08-09 D-max trucks. Can anyone tell me anything that they didn't know about the truck until after they got it home? Is there anything I NEED TO KNOW before making a purchase?

    thanks again!!


    2009 Silverado 2500HD
    Duramax Z-71
    Crew Cab
    Line-X spray-in liner
    Re-Trax retractable tonneau cover

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