High idle on interstate, idle corrects after restart.
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1993 Buick LeSabre Question: Excessive gas usage
Answer #1patrick mannion from Greg Solow's Engine Room, September 13, 2009, 16:17Master
Check out this government website
Lost of things can contribute to poor fuel economy. Ensure your car has had basic maintenance (spark plugs, fuel filter and air filter). The oxygen sensor coolant temperature switch and air flow entering the engine are the three key inputs the computer in your car uses to trim and adjust the fuel mixture.