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  1. #1

    Default 6.0L gas mileage

    Hey guys new to the site. I guess a few questions. I'm thinking about buying a silverado 2500 hd with the 6.0L motor for better towing. currently have an 04 avalanche with the 5.3L. What can i expect real world fuel mileage wise out of the 6.0L, and if i get a gas programmer right away which i would, what kind of fuel mileage could i expect then? I get 14/18 average with the Avalanche and hope with adding the programmer to the 6.0L I wouldn't be far off of that for daily mixed driving. Thanks for the help.

  2. #2


    You can expect about 12-13 mpg. I do mostly highway at 65. Usually get just shy of 13. Same before my truck was lifted
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #3


    I get between 11 and 13mpg around town with my 3500 extended express van. 16mpg on a tank full once with the wind at my back going down hill.

  4. #4
    Sr. Mechanic chevyman2004's Avatar
    Join Date
    Jul 2009
    southwest Minnesota


    highway no wind i get 15-16 mpg at 60-65 mph, around town i get 8-9 mpg.

    2004 Chevy Silverado 2500HD:sign0011:
    6.0L Vortec
    Magnaflow 4" Dual Exhaust
    Leveling Kit
    Westin step bars
    Penda Skid Resistor bed liner
    dark blue metallic
    Bak Industries plastic bed rail caps
    Alpine 6 1/2" SPS-600 in front
    Alpine 6 1/2" SPG-17C2 in rear
    Bilstein HD Shocks front and rear
    Goodyear Wrangler Duratracs LT265/75/R16
    Access Lorado Roll-up soft tonneau cover

  5. #5
    Jr. Apprentice
    Join Date
    Aug 2006
    hard hittin new britain ct.


    i get between 11 and 13. pulling a trailer with a 3000 lb car and the bed loaded with tools and spares it like 8 to 10
    2008 Silverado 2500 HD Crew cab LTZ 6.0

  6. #6

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    the first questoin is do you really need a 2500 HD for towing? My dads 1/2 ton 6.0 gets 19 easy on the highway and has hit the 22-23 range before.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  7. #7


    Quote Originally Posted by vncj96 View Post
    the first questoin is do you really need a 2500 HD for towing? My dads 1/2 ton 6.0 gets 19 easy on the highway and has hit the 22-23 range before.

    I'm going to be buying a 27-29 ft travel trailer or a 5th wheel and I really don't want to max out my Avalnche. Not worried so much about the 5.3L's power. Concerned more with the suspension and brakes. The biggest thing is i don't really know if i want to go diesel(cost). Love the power and GAS MILEAGE of the 5.3L. The BIG question I have is what kind of horsepower and GAS MILEAGE gains are people seeing with a gas programmer on the 6.0L? Especially on the 2500HD.

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