Here are the ten best, in order:
1. Toyota Prius
2. Honda Civic Hybrid
3. Toyota Camry Hybrid
4. Ford Escape Hybrid FWD
5. Toyota Yaris (manual)
6. Toyota Yaris (automatic)
7. Honda Fit (manual)
8. Toyota Corolla (manual)
9. Hyundai Accent (manual) tied with the Kia Rio (manual)
10. Ford Escape Hybrid 4WD tied with the Mercury Mariner Hybrid 4WD
While the gas-sipping Prius topped the list with EPA economy numbers of 60 mpg city and 51 mpg highway, the much less expensive gas-only Toyota Yaris and Honda Fit turned in very impressive numbers (34/40 and 33/38, respectively for the manual transmission versions).
Perhaps the most entertaining aspect of the report is the seeing the EPA categorize the Aston Martin DB9 as a "minicompact," the Bentley Azure as a "subcompact," and the Ferrari 612 Scaglietti as a "midsize" car. (All three posted worst-in-class numbers, by the way.)
Lots more info at the government's fuel economy website, here.