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Toyota Prius C

13 most fuel-efficient new cars of 2014

The vehicles we spotlight here are the least thirsty in their price categories, based on annual fuel costs. The fuel cost assumes 15,000 miles of combined city and highway driving each year and gasoline prices of $3.40 a gallon for regular, $3.70 for premium and $3.90 for diesel, or for electric cars, 12 cents per kilowatt hour.

To be eligible for the most-fuel-efficient award, each model must have been designated a top 25 pick in its category, and no vehicle can win if another trim level of that model has won in a lower-price category.