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12 worst cars for the environment in 2011

Mercedes-Benz G550 parked in front of bridge

Photo: Mercedes-Benz

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Mercedes-Benz G550

A Mercedes doesn’t need an AMG label to be designated as one of the worst cars for the environment. The 382 horsepower, 5.5L 8-cylinder engine Mercedes-Benz G550 has the same fuel efficiency ratings as the smaller ML 63 AMG — 11 mpg city and 15 mpg highway. Both vehicles earned a Green Score of 21. For $105,000, the starting price of the G550, consumers would be better off buying a Tesla Roadster — a sexier vehicle with no eco guilt.