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The Honda Insight is the most fuel-efficient automobile, according to the Environmental Protection Agency (EPA).

Often described as sporty but frugal, the Insight is also arguably the most unusual-looking vehicle on the road (until, of course, the Smart Car Fortwo arrives in 2008).

Introduced in 1999, the Insight was the first hybrid available in North America. The Toyota Prius was introduced in Japan in 1997.

Despite numerous honors, the Insight never sold well — about 13,200 total during its six-plus year run. And in September, 2006, Honda stopped production. During its tenure, the Insight gained as much attention from its unique appearance as it did from its gas mileage — 60 mpg in the city, 66 mpg on the freeway.

The Insight is powered by both a 1.0-liter three cylinder combustion engine and an electric motor. Together they produce 73 horsepower with the five-speed manual transmission and 71 horsepower in the Continuously Variable Transmission. The power for the electric motor is stored in a 48-pound, 144-volt battery behind the seats.

Here are top 11 most fuel-efficient cars in North America and their city and highway average mpg.

1. Honda Insight — 60/66 mpg
2. Toyota Prius — 60/51 mpg
3. Honda Civic Hybrid — 49/51 mpg
4. Toyota Camry Hybrid — 40/38 mpg
5. Toyota Yaris — 34/40 mpg
6. Honda Fit — 33/38 mpg
7. Toyota Corolla — 32/41 mpg
8. Honda Civic — 30/40 mpg
9. Scion xA — 32/37 mpg
10. Hyundai Accent — 32/35 mpg
11. Nissan Versa — 30/36 mpg