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Q: Excessive gas usage on 1993 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
High idle on interstate, idle corrects after restart.
(1) Answer
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Check out this government website
http://www.fueleconomy.gov/Feg/noframes/10103.shtml
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.