Entry-level coupes and sedans are generally best for mileage because of the small size of both the car and engine. So the Corolla, Toyota's smallest model, fits the bill, having gotten more than 30 miles per gallon over the past several years, and up to 37 mpg on the interstate. Like the Civic, there's no hybrid powertrain, but it is a better fuel "sipper" than some older cars with electric-gasoline powertrains.