We've compiled a list of the 10 most fuel-efficient cars currently sold in the U.S. based on the Environmental Protection Agency's (EPA) miles-per-gallon ratings for city and highway travel. In order to arrive at a final hierarchy, we used the EPA's combined fuel economy formula: 55 percent of city mpg rating plus 45 percent of highway mpg rating. The rating for each vehicle below is expressed in mpg as a city/highway ratio. All ratings apply to base models equipped with a manual transmission, except where indicated otherwise with an asterisk. Also, we only allowed a given model to appear once on the list, except in the case of the Honda Civic because it's available in both gas-electric hybrid and regular gasoline versions.

1. Honda Insight — 61/66
   
   
2. Toyota Prius — 60/51*
   
   
3. Honda Civic Hybrid — 45/51
   
   
4. Volkswagen Golf TDI — 38/46
   Volkswagen Jetta TDI — 38/46
   Volkswagen New Beetle TDI — 38/46
   
   
5. Honda Civic HX — 36/44
   
   
6. Toyota Echo — 35/42
   
   
7. Toyota Corolla — 32/41
   
   
8. Scion xA — 32/37
   
   
9. Honda Accord Hybrid — 30/37*
   Pontiac Vibe — 30/36
   Toyota Matrix — 30/36
   Scion xB — 31/35*
   
   
10. Dodge Neon — 29/36
    Toyota Celica GT — 29/36*