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  1. #1

    Default how to improve fuel mileage on a 03

    I have a 03 silverado 1500 with a 5.3, 3.73 rear end, with 285/75/16 tires, mbrp dual exhaust. I'm only getting 12mpg, seems like i should be getting at least 15 or so looking at what others get. I have a new MAF sensor, new y-pipe w/ cat's, all o2 sensor's replaced, new fuel filter, I do all regular maintenance as well. if anyone has any suggestions, anything would be appreciated. Thomas
    2003 CHEVY SILVERADO
    3" LEVELING KIT
    285/75/16 DURATAC'S
    MBRP STAINLESS DUAL'S

  2. #2
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    murdog94's Avatar
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    Default

    I would like to know what you have done for regular maint? plugs, filters? also you say 12mpg is that highway or city? and how are you driving doing that (ive had 3 of these trucks with the 5.3L and the milage on each was different)
    BTW that is a nice looking rig!
    Mike

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  3. #3
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    Have you adjusted for the taller tires?
    What came stock-maybe 265/70 16??
    They might be 2" taller than stock meaning you are actually getting maybe 1mpg better than calculated
    Charlie
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  4. #4

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    THIS...


    ________2013 4C Rated__________


  5. #5
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    Did you recalibrate the speedometer after increasing your tire size? This will throw off your speedometer , odometer and fuel mileage. Also a free breathing Cold Air Intake combined with a less restrictive exhaust can help. There is also the option to purchase a handheld programmer that has the ability to set the fuel management for fuel economy, towing, performance or stock. Diablo, Edge, Hypertech, super chips all make nice units.

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    Yes you definitely have to recalibrate for taller tires- or just do a little multiplication each time.
    For example if your OEM tires were 31" and current are 33"
    do this
    12MPG X33/31=12.7MPG
    Same story with what your odometer reads- multiply it by a correction factor
    You are going farther and faster that your odomter and speedometer are reading.
    Another thing-those wider taller heavier tires have more aero resistance and rolling resistance and take more power to accelerate(and brake) than the stock tires
    They have look to have fairly aggressive tread-probably more rolling resistance
    Oh-did I mention-Nice looking tires/truck
    Last edited by phoebeisis; 02-14-2012 at 04:56 PM.

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