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3 - Smart ForTwo
Mileage: 33 city, 41 hwy

The ForTwo, a two-seat car, relies on small size, light weight and a tiny three cylinder engine to get a great "Green Score." Besides contributing the car's fuel efficiency, weight itself was a big factor in the ACEEE's scoring. The assumption is that heavier cars create more waste and emissions in their manufacturing and disposal than lighter cars.



NEXT: 4 - Toyota Prius
Last updated February 15 2011: 3:50 PM ET
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