Nine of the top-10 most fuel efficient vehicles in the U.S. are hybrids. The agency, which sets guidelines and gives estimated fuel costs and mileage standards each year in its Fuel Economy Guide, released the following EPA ratings for 2010 models:
1. Toyota Prius, 51 mpg city/48 mpg highway; 2. Ford Fusion/Mercury Milan, 41/36; 3. Honda Civic Hybrid, 40/45; 4. Honda Insight (hybrid), 40/43; 5. Lexus HS250h (hybrid), 35/34; 6. Nissan Altima Hybrid, 35/33; 7. Ford Escape Hybrid FWD, Mazda Tribute Hybrid 2WD, Mercury Mariner Hybrid FWD, 34/31; 8. Smart fortwo Cabriolet (automatic) Smart fortwo Coupe (automatic), 33/41; 9. Toyota Camry Hybrid, 33/34
10. Lexus RX450h (hybrid, 2WD), 32/28.