1998 Jimmy, fuel mileage sucks!

Discussion in 'Performance & Fuel' started by otis24, Jan 22, 2009.

  1. otis24

    otis24 Member

    I have a 1998 GMC Jimmy (4.3, 4WD). It has 115k miles and was a one owner vehicle. I've owned it about a month. Previous owner changed oil every 3k miles. I just changed plugs (platinum), wires, rotor and cap. The vehicle is not throwing any codes. I drive about 3 miles one way, twice a day. I'm getting about 10 MPG (or less).

    My previous vehicle (1994 GMC Sonoma, 4.3 TBI, 110k miles) was getting about 15 MPG in town. I was lead to believe that the multi-port injected, better balanced motor in the Jimmy would get better MPG. What gives?

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