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  1. #1

    Default Ugly fuel economy Need suggestions

    09 Silverado Z71 5.3 6speed auto with AFM. it gets 14 in town and 15 on the hwy. Normal driving not hot rodding, on hwy i have tried 68 to 78 and it still sucks, I now have 26k on her and am not a happy camper as my 2003 did much better by far. Need input.
    Thank you

  2. #2

    Default

    Type of tires and low tire pressure can rob a few MPG's
    Have engine PCM tuned for economy.
    Drive downhill all the time
    2002 Tahoe LS 4x4 5.3 Flex Corvette Servo AVS In-channels JVC KD-PDR80 BB Engine Tune Front Mounted Receiver
    1984 3500 3+3 Crew Cab 350 w/Edelbrock 600 700R4 w/Corvette Servo & manual TCC AVS Surface Mount JVC w/Sub

  3. #3
    Master Mechanic Silverado Junkie's Avatar
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    Feb 2010
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    Lead Hill, Arkansas
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    541

    Default

    Thats only a few mpg from normal. Also, tires, tire pressure, elevation, and type of driving(flat plains or hilly country) all effect mpg's. So id say do a few easy motor mods(intake, exhaust, tune) and be easy on the throttle and you'll get great millage.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

  4. #4

    Default

    Buy a civic!!
    John

    06 Red GMC 4X4 CrewCab 4.8L
    MagnaFlow Muffler
    Lubed by AMSOIL...

  5. #5

    Default

    go ahead, buy a civic detailjohn says, but then watch out you might get run over.

    '01 Chevrolet S10
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    If at first you don't succeed, then skydiving is not for you.
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  6. #6

    Default

    A Civic would be wonderfull but I would not like to be seen in one.
    I drive all flatland, tires are always inflated correctly, I live wth no hills, no reason why the truck gets poor fuel econony.

  7. #7
    Sr. Mechanic Gambit's Avatar
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    Feb 2010
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    VA Beach for now
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    189

    Default

    These trucks are only rated for a MAX of 25 on the highway. Are you running bigger tires? Lift? remove the lower air dam? all these things could effect your gas mileage.

    Was your 2003 a Z71 4x4 also?
    Jeep Recovery Vehicle.

  8. #8

    Default

    Quote Originally Posted by Silverado Junkie View Post
    Thats only a few mpg from normal. Also, tires, tire pressure, elevation, and type of driving(flat plains or hilly country) all effect mpg's. So id say do a few easy motor mods(intake, exhaust, tune) and be easy on the throttle and you'll get great millage.
    what kinda tuning device i can use after intake/exhaust....i have a 5.3 L gas

  9. #9

    Default

    i get around 14 mpg combine hwy/city....but my truck is for work...always loaded...and have camper shell and ladders on top

  10. #10
    Master Mechanic bigdaddy77084's Avatar
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    Jan 2010
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    Houston, Texas, United States
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    649

    Default

    Put up a sail.!! I havent got 14mpg with mine down hill.
    95 tahoe 2dr 4x4 200,000+ miles

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