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What is the weight of a car, if the car is able to get 32 miles...

What is the weight of a car, if the car is able to get 32 miles per gallon traveling at a steady speed of 70 mph on a level road, with no wind? The car has a drag coefficient of 0.22 and a frontal area of 15 square feet and we assume the energy delivery of gasoline is 20% with a heat of combustion/energy content of gasoline being 124,000 Btu/gallon.
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