The following 13 vehicles are rated the most fuel efficient in their class, according to EPA estimates and Forbes.com:

strong>Two-Seater:  Smart Fourtwo (33 mpg city / 41 mpg highway)
Subcompact:  Toyota Yaris (29 mpg city / 36 mpg highway)
Compact:  Mini Cooper (28 mpg city / 37 mpg highway)
Hybrid:  Honda Civic Hybrid (40 mpg city / 45 mpg highway)
Midsize:  Toyota Prius Hybrid (48 mpg city / 45 mpg highway)
Large Car:  Honda Accord (22 mpg city / 31 mpg highway)
Hatchback:  Honda Fit (28 mpg city / 34 mpg highway)
Wagon:  Volkswagen Passat (21 mpg city / 29 mpg highway)
SUV:  Ford Escape Hybrid (34 mpg city / 30 mpg highway)
Minivan:  Mazda 5 (22 mpg city / 28 mpg highway)
Truck:  Ford Ranger Pickup (21 mpg city / 26 mpg highway)
Sports Car:  Audi TT Coupe (23 mpg city / 31 mpg highway)
Luxury: Mercedes E320 Bluetec (23 mpg city / 32 mpg highway)