10. 2014 Audi A6 TDI Quattro Tiptronic
Powered by a 3.0-liter V6 turbo-diesel engine, the Audi A6 TDI Quattro Tiptronic is one of several clean diesel vehicles that make it onto the list. With 240 hp and 428 lb-ft of torque available to its driver, the A6 TDI manages a respectable 24 mpg in the city and 38 mpg on the highway for a 29-mpg combined rating. Priced from $58,395 for the 2014 model year, the A6 TDI is an attractive option for luxury sedan shoppers looking to go green.
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