Midsize cars - 2013 Toyota Prius
Gas mileage (city/highway; combined mpg): 51/48; 50
Efficiency-cost rating: 2.00
With an efficiency-cost rating of 2.00, the 2013 Toyota Prius is the best of the midsize cars and third overall—quite an accomplishment considering its interior volume and thrifty fuel numbers. If you value roominess along with results, the Prius remains the king of the hybrids.