Why would a Cutlass Ciera Oldsmobile run through the gas so fast on the highway driving granny style. The motor sounds good and there's no smell of gas while driving.
I don't have a clue....
You didn't state the year, copy and paste the below for what the fuel economy should be for your year car, if its low you may need a good tune up, including replacing all the air filters, an oil and transmission fluid change. Tires play a key roll in economy and if your are driving city or highway miles... http://www.fueleconomy.gov/feg/bymodel/1993_Oldsmobile_Cutlass
Most likely the transmission is not shifting into overdrive and the torque converter clutch isn't locking in. It's common on GMs. HTH. -Jim
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