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12 'meanest' cars environmentally in 2013

Some cars are environmental terrorists.

Here are 12 of the "meanest" cars as ranked by GreenerCars.org, using its Green Score index.

GreenerCars.org analyzes vehicles with a measure that incorporates tailpipe emissions, gas mileage and gas emissions that contribute to climate change. The scale goes from zero to 100, with a lower score indicating a car with more environmental impact.

Miles per gallon, specifications and the Green Score are from GreenerCars.org. The Manufacturer's Suggested Retail Price is from the carmaker or FuelEconomy.gov.

Bentley Mulsanne

Model starting MSRP: $296,000


Specifications: 6.8-liter eight-cylinder engine with manually adjustable automatic transmission; uses premium gas
11 mpg city/18 mpg highway
Green Score: 21

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