Ugly fuel economy Need suggestions

Discussion in 'Performance & Fuel' started by jstforfunn, Feb 21, 2010.

  1. jstforfunn

    jstforfunn New Member

    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. Uncle Ed

    Uncle Ed New Member

    Type of tires and low tire pressure can rob a few MPG's
    Have engine PCM tuned for economy.
    Drive downhill all the time :)
  3. Silverado Junkie

    Silverado Junkie Rockstar 4 Years 500 Posts

    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.
  4. detailjohn

    detailjohn Rockstar 100 Posts

    Buy a civic!!
  5. Stealth

    Stealth Epic Member 5+ Years 1000 Posts

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

    jstforfunn New Member

    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. Gambit

    Gambit Rockstar 100 Posts

    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?
  8. udontknowjack

    udontknowjack Rockstar

    what kinda tuning device i can use after intake/exhaust....i have a 5.3 L gas
  9. udontknowjack

    udontknowjack Rockstar

    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. bigdaddy77084

    bigdaddy77084 Epic Member 5+ Years 500 Posts

    Put up a sail.!! I havent got 14mpg with mine down hill.

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