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  1. #11
    Sr. Mechanic ChevyHD's Avatar
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    Jan 2011
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    Elberon, Iowa, United States
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    179

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    Would you loose much fuel mileage going from 265's to 285's? I was looking at the exact setup.
    Adam
    2004.5 CCSB Duramax
    Max Effort Tuning by Idaho Rob - Goerend Transmission - PCV ReRoute - EGR Blocked - Plugged Resonator - 5" Diamond Eye Turbo Back - Tie Rod Sleeves - All On Mod - Edge Insight CTS - Recon Taillights, Cab Lights, & 3rd Brake Light

  2. #12

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    Quote Originally Posted by ChevyHD View Post
    Would you loose much fuel mileage going from 265's to 285's? I was looking at the exact setup.
    you might a little. mileage goes with weight of the tire, which will be increased most likely and rolling resistance. since it is a fairly aggressive tread pattern could lose some there. there isnt a huge difference in the tire sizes.

    stock
    31.6" diameter
    new
    32.8"

    Remember your speedo will be off. you will be driving roughly 62.2 mph when the speedo reads 60.
    Heres the link for the info.
    http://www.miata.net/garage/tirecalc.html
    David
    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.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #13
    Sr. Mechanic chevyman2004's Avatar
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    Jul 2009
    Location
    southwest Minnesota
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    194

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    stock was 245's, so 285 would be 4 mph difference?

    2004 Chevy Silverado 2500HD:sign0011:
    6.0L Vortec
    Magnaflow 4" Dual Exhaust
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  4. #14

    Default

    your right I was putting in the OP's stock size of the 265's not our trucks 245's. didnt notice he had the 2500 when he said exact setup I just assumed.

    stock
    30.5
    new
    32.8

    going 64.7 when reading 60
    David
    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.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

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