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12 worst cars for the environment in 2011

Mercedes-Benz ML 63 AMG on road

Photo: Mercedes-Benz

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Mercedes-Benz ML 63 AMG

When a Mercedes-Benz comes with an AMG label, consumers know that they are buying a top-of-the-line Mercedes with an added focus on performance. The Mercedes-Benz ML 63 AMG luxury SUV gets only 11 mpg in the city. Despite its measly fuel efficiency rating, the California Air Resource Board (CARB) classifies the vehicle as an LEV II.