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  1. #1
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    dwill3015's Avatar
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    Default GM Diesel Fuel Mileage

    Our number of members owning GM diesels are growing everyday. What year and version of GM diesel do you own, what is your average fuel mileage, and what mods have you done to improve it?

    I have a Duramax LBZ in my 2006 Silverado. My average mileage is 16-17in the city, 19+ on the highway with a 6" lift running 35's and 3.73 gear ratio. I have added 5" Diamond-Eye cat-back exhaust, a modded stock air box (breathes better than stock) and a Godzilla Stealth2 programmer set on 70hp tune (best mileage with this setting).
    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.

  2. #2
    Jr. Apprentice CaptnBud's Avatar
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    Thumbs down

    Average 14 around town, Maybe 15 on a trip with any luck. 14,000 miles, 10k was an around the country in the spring pulling a 30' Coachman averaging 9.5 - 10 mpg. 2008 LMM completly stock. I can't justify Voiding thr Warranty.
    Bud

    2008 LTZ, 4X4, Extended Cab, LB, Silver Birch Metallic. Z71, Trailer Package, IBC, Lear Cap Reused from 2003 LT. Class III Front Receiver W/ Winch wired Front & Rear

  3. #3

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    thought they would give better mpg than that....

  4. #4
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    dwill3015's Avatar
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    Default

    Mine is still under full warranty. My service manager at the local chevrolet dealership told me that programmers are great and recommends them but anytime the truck is brought in for service, return it to the stock tune in case the ECM needs to be updated. Once out of the shop, I hook the programmer back up and install my tune etc. My exhaust is cat-back so i have not changed my warranty there either.

  5. #5
    Legend

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    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
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    Default

    Wow, 19mpg highway with a 6" lifted 7000 lb 4x4 truck is very, very good. 16-17 city is even more spectacular.

    My 98 Suburban-2wd 5.7- gets 20-21 mpg hy but 12-14 mpg city. It is maybe 1500 lb lighter, 2wd, isn't lifted,and has tiny 235/75 15" tires/wheels.

    I would have never guessed a 3/4 ton 4x4 with a lift could get more than 16mph highway and maybe 11mpg city.Especially with those kinda aggressive looking tires-aggressive tires usually hurt mpg.

    Pretty good mpg.
    Nice looking truck also.Wanta' trade!!??

    Charlie
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

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