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Toyota Prius
Toyota Prius
Lowest base price: $21,100
No "Green Car" list could be complete without the Toyota Prius. A pair of electric motors help the Prius make the most efficient possible use of its 1.5-liter 4-cylinder engine, giving it the highest fuel economy of any mass-market car sold in America.

The Prius has a sizable battery pack which, because of their chemical content, raises environmental questions regarding manufacturing and disposal. ACEEE does not see hybrid batteries as posing a significant environmental problem saying that a car's biggest environmental impact by far comes from its use.

NEXT: Honda Civic Hybrid

Last updated February 19 2008: 6:51 PM ET

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