ANSWERS: 1
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Cars rated highest in fuel efficiency by the United States Department of Energy get highway mileage of 31 miles per gallon and above or city mileage of 22 miles per gallon and above. Gas mileage can be affected by the size of the car, the condition of the car, variations in fuel and variations in where and how people drive.
Source:
United States Department of Energy: 2010 Most and Least Fuel Efficient Vehicles
United States Departent of Energy: Your Mileage Will Still Vary
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