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2007 Chevrolet Uplander Question: Why has gas mileage has dropped from 21 to 15 run great and air filter is clean

 

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tomas e, Harbor Springs, MI, June 06, 2012, 06:33
 Rookie

Why has my mileage dropped? Dealership says everything looks good and supposedly checks out, sir filter is clean and the engine runs great.

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  • Answer #1

    Miles Auto Services (884 Answers) , Richmond, VA - (804) 885-4176
    milesauto June 06, 2012, 07:26
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    Are you checking your mileage in around town driving or a long road trip? Driving habits have more to do with than one would think sometimes.

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  • Answer #2

    Greg's Orange Auto (13616 Answers) , Orange, CA - (714) 361-9386
    globalhelper June 06, 2012, 12:17
     Master

    have fuel trim ck it could be cause by a number of things and scan for codes

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    tomas e, June 07, 2012, 05:03
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    What exactly is fuel trims and what kind of codes should my mechanic check for? Thanks and God Bless

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    milesauto, June 07, 2012, 05:31
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    It may not have any fault codes....Fuel trims are a way that the technician may be able to tell if for some reason the fuel control system may be making the system run a bit on the lean side due to perhaps a vacume leak or on the rich side due to a lazy oxygen sensor or a dirty fuel injector. This requires a good technician to dig for possible problems....best make sure you really have an issue first by checking your fuel mileage accurately on a road trip.

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