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  1. #11


    I got 20 in my old 6.2 k5 around town. Open up the exhaust and intake and it will work wonders. Combine that with easy acceleration and you should see 20, even with the emissions gear.

  2. #12

    Default Edge

    I use the Edge juice with the attitude controller display. The display helps out by showing you some useful numbers like boost, EGT, Temp, etc, etc. Bully Dawg and Banks have similar products. Diesels make power by adding fuel, so the higher the setting ... less mpg. Changing my driving style did more than anyhting though.
    The open (cold-air) intake didn't have any affect on my mileage, but it did drop my EGTs by about 120 deg under load on average.
    Brian / BigPapa

    2008 Silverado 2500 HD
    6" Tuff Country Lift
    35" Toyo M/Ts
    20" Ultra Wheels
    Edge Juice w/ Attitude Controller (Hot Unlock)
    AFE Stage II intake
    AirLift Rear AirSpring System
    Touch-screen audio/dvd with JL Sub

  3. #13
    dwill3015's Avatar
    Join Date
    Jan 2007
    Yacolt, Washington
    Blog Entries


    Sorry to reply so late but there are some great in-expensive programmers out there that work awesome like the Diablo Sport and the Quadzilla. I bought my quad for under $300 and has helped me out a bunch for mileage, speedo calibration for running larger tires), performance (5 tunes to choose from), DTC reader, and diagnostics scanner (found I had a bad injector before the dealer did). Later down the road I want to get EFI Live and do some custom programming on my own.
    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.

  4. #14


    Got a consistent 18.75 on a '95 Tahoe turbo diesel. City or highway.

  5. #15

    Default diesel mpg

    hi all,

    Question into what turbo and intercooler is the best to use for the 5L diesel in DARWIN.





  6. #16


    My dad gets 20+ with the diablo driving... Towing a 25ft camper at 75 mph he gets 16mpg... Its 04.5 gmc 6.6

  7. #17


    Good fuel additives are a must. There are varying opinions on which is best but you want to stay away from anything with alcohol in it because it will dry things out too much. You should also consider cetane booster. Most ULSD have only the minimum cetane in them which I believe is 40. The cetane will help with combustion which will improve performance and fuel economy too.

    I use AMSOIL additives and have had good success.
    2006 2500, LLY, CCSB, LT3, Edge Evo Level 3
    AMSOIL in the powertrain and fuel system

  8. #18


    What's the average MPG on here for Duramax owners?

    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  9. #19


    Quote Originally Posted by Steve View Post
    What's the average MPG on here for Duramax owners?
    During the 2 years I had mine, my average was 15.67 mpg over the whole 2 years.

    Airforce Veteran (7 years)

    NRA Life Member

  10. #20


    Mine is around 13 overall that is pulling my trailer and plowing snow included. Normal driving city/highway is around 16.
    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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