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  1. #21

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    Im in the same boat as you... have the 05 1500HD with the 6.0. Lifted with flowmaster exhaust and 33in tires i was getting 9.5 in city with lots of hills and curves.. just got banks cold air intake and banks automind programmer for it and i am now getting 11mpg in city and 13 on highway... so that is how much it helped on my truck if that is what you were wondering... Im still not sure if it was worth spending as much as i did on it but for now it seems like its been worth it... i was considering on trading in for a newer truck that would get better but for now im gonna stick with this one.. maybe later on down the road i will do that but the cai and programmer can maybe get me by for a while... they cost me about 300 for each

  2. #22
    Sr. Mechanic chevyman2004's Avatar
    Join Date
    Jul 2009
    Location
    southwest Minnesota
    Posts
    194

    Default

    I get 14-16 mpg on the highway and 9-11 mpg city with my 2004 and that is driving pretty conservatively. 60-65 mph highway. If i put a tonneau cover on I think i should get an extra 10%, or at least that's what they say.
    Last edited by chevyman2004; 05-24-2011 at 08:18 PM.

    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

  3. #23
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    You said you bought the truck used, have you ever changed the spark plugs/tuneup? Are the OEM plugs in it or did someone change them to something else? VORTEC motors are very susceptable to MPG drop when anything other then the factory OEM recommended plugs are used. Stay with the AC/Delco iridiums. i am sure that you have 4:10 gears being that its a 2500 but I know plenty of people with the 6.0 that get 18+mpg on the highway.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

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