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  1. #1
    Legend

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    East of Branson, Missouri
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    Default Ultimate MPG guide - Check Expected Mileage (Pleas enter your verified mpg info)

    Well, it's time for a definitive MPG guide.

    What can you expect for your vehicle with certain upgrades?
    What kind of mileage can you expect on a new (to you) truck?
    How badly will larger tires affect your mileage?

    Hopefully we can get this guide to a point where all these questions will be answered and more.
    Please feel free to reply to this post and enter your own information. PLEASE keep your post factual - make sure your mileage has been verified more than once to ensure accuracy. Information we need is: Model, Engine, relevant upgrades, and what kind of roads (hwy, city, 50/50)?

    Your post will be added to the list below and deleted afterwards to keep things clean and easy to access.

    **if your vehicle is already listed, please don't let it stop you from entering your own information to verify or correct a current one**
    __________________________________________________

    1988 GMC Suburban - 350 - 13 mpg (50/50)
    1993 K1500 - 350 - 12.5 mpg (City)
    1993 Chevy Suburban 2500- 7.4l, 454, 4wd, dual exhaust, K&N filter - 13.9/7.9 mpg (Hwy/Heavy Towing)
    1994 Chevy Suburban K2500 - 7.4l, 454, 4wd - 12.5 mpg (Hwy)
    1996 GMC Sierra 1500 - 5.7l, Reg. cab - 17 mpg (City)
    1996 GMC Suburban K1500 - 18.5/16 mpg (Hwy/City)
    1997 GMC Sonoma - 4 cyl., 5 spd, electric fan, underdrive pulley, CAI - 32 mpg (50/50)
    1997 Chevy Suburban - 2WD, 5.7l - 20.5/16 mpg (Hwy/City)
    1998 GMC Sierra 2500 - 454 - 15/11/10 mpg (Hwy/City/Towing)
    1998 Chevy Suburban - 2wd - 11.3 mpg (City)
    1998 Chevy Suburban 1500 - 12 mpg (City)
    1999 Chevy Suburban K2500- 7.4l, 454, 4wd, 2" body lift, 305.75.16 - 10.5 mpg (50/50)
    2001 Chevy Suburban K1500 - 5.3l, 4wd - 15/11 mpg (Hwy/City)
    2001 Chevy Suburban K1500 - 5.3l, 4wd, K&N air filter - 17/12 mpg (Hwy/City)
    2002 Chevy Suburban - 2WD, 5.3l, FlexFuel - 20.5/14.5 mpg (Hwy/City)
    2003 Chevy Silverado 1500- 5.3l, Extended cab - 19.4 mpg (50/50)
    2003 Chevy Suburban - 5.4l - 15.4 mpg (50/50)
    2004 1500 WT - V6, 4.3l, 2wd, K&N filter, short bed - 20 mpg (50/50)
    2004 Silverado Z/71 - 5.3l, crew cab - 18 mpg (50/50)
    2005 Chevy Silverado - 6 cylinder, K&N CAI, MSD Ignition, Cat back dual exhaust - 20 mpg (Hwy)
    2005 Chevy Silverado - 5.3l, K&N FIPK, Magnaflow muffler, Hypertech Max Energy - 20 mpg (Hwy)
    2005 Chevy Silverado - 4.8l, 2wd, Reg cab, short bed - 23.5/19.2 mpg (Hwy/City)
    2005 GMC Sierra 2500HD - 9 mpg (City)
    2006 Chevy Colorado - unknown engine, 4wd, crew cab - 29 mpg (50/50)
    2006 Chevy Trailblazer - 4WD, 3.73 - 19.5 mpg (Hwy)
    2006 HHR - 2.4l - 28.5 mpg/32.2 (City/Hwy)
    2006 GMC Sierra - 5.3l, crew cab, Colant CAI - 19 mpg (unknown)
    2006 GMC Sierra - 4.8l, crew cab, 4wd- 10.5 mpg (Hwy)
    2007 Chevy Tahoe - 5.3l, 4wd, Diablo Tuner - 15 mpg (50/50)
    2007 Chevy Tahoe - 5.3l, 4wd - 15.7 mpg (50/50)
    2007 Chevy Suburban - 5.3l, - 16.5 mpg (50/50)
    2007 Chevy Colorado - 4 cylinder, 5 spd - 23 mpg (50/50)
    2007 Chevy Silverado Classic - 5.3l, Flowmaster dual exhaust, programmed with Hypertech - 19 mpg (50/50)
    2007 Chevy Silverado Z71 - 5.3l, crew cab - 18.5 mpg (50/50)
    2008 Chevy Colorado - 3.7l - 16 mpg (50/50)

    2005 Chevy Silverado 1500 5.3l crew cab 4x4 with fiberglass topper - 15/19 (cty/hwy)
    Last edited by 04sierracrewcab; 04-14-2009 at 12:23 PM.

  2. #2

    Default

    1996 GMC Sierra - (17/22)
    (City/Highway)
    I was getting 20 but I chopped off my exhaust and put a 5 inch dump and the lower backpressure gave me better mileage.

  3. #3

    Default

    My 2003 Chevy Trailblazer LT gets 14 city 16-18 highway. It does take a MI pothole very well!!!

  4. #4
    Legend bry2500's Avatar
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    Oct 2008
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    Default

    2002 Avalanche 2500 8.1l/496ci

    100% stock

    11 mpg city
    13 mpg highway

    ~10 mpg highway with 5700 lbs in the bed. (not recommended)
    Last edited by bry2500; 06-03-2009 at 10:56 AM.
    BRYAN

    "IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"

    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

  5. #5

    Default

    2006 Chevy 2500HD, Crew Cab, 6.6L Diesel, stock, no load highway at 60mph, 21mpg. At 70mph, 18mpg. Towing 8500Lb. 5th wheel, 11mpg average at 55 to 60mph overe 8,000 mile trip.

  6. #6

    Default

    2002 GMC Yukon XL 8.1L
    14mg combined, daily drive to work consist of country back roads @ 55mph
    "enough torque to tenderize an elephant"

  7. #7

    Default

    With 60/40 hwy/city driving, I avg. 18.8mpg on my 2010 Colorado w/5.3L V8.


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  8. #8
    Legend mmorgan1865's Avatar
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    Feb 2010
    Location
    Port Orange, Florida
    Posts
    1,067

    Default

    15.5 City with a light foot.
    Morgan
    2010 Silverado Ext. Cab LTZ 2 WD 6 ft bed
    5.3L 6 speed w\ 3.08 rear end
    Navigation Package
    Westin lighted boards
    Undercover SE tonneau cover
    It's a start!

  9. #9

    Default

    99 1500 silverado ext cab 5.3 all stock 16.5 (50/50)
    99 Silverado Ext Cab Z71 Third Door
    All stock for now

  10. #10

    Default

    2003 Silverado 1500 4x4 Z71 Short Bed, Extended Cab
    285x75R16's and 3.73's (not stock tires - stocks are 265x70R16's)
    3" body lift

    14-15mpg DD mostly country roads, some stop/go
    15-16mpg hwy
    dont ask - towing/heavy (I don't know and I don't want to know )

    Everything else is stock - intake, exhaust, tune. Thought about a regear to 4.56's to drop the engine load, but I will dump it in about a year. I want to try programming - easy to do compared to gears and with the time left that I will have it the time/work investment in gears isn't really worth it.

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