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12 worst cars for the environment in 2011

April 13, 2011, 10:25 a.m.
Bentley Mulsanne on white background

Photo: Bentley

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Bentley Mulsanne

The Mulsanne is the first of two Bentleys that have earned a spot on the worst cars for the environment 2011 list. The classic luxury sedan averages 11 mpg in the city and 18 mpg on the highway, earning the Mulsanne a Green Score of 22. The 505 horsepower, twin-turbocharged V8 engine has a top speed of 184 mph and belches out 393g/km of CO2 emissions.