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The gas guzzlers are the big cars and SUVs--not necessarily the sports cars.
The Boxster, for example, is extremely fuel efficient, averaging 26 mpg or so in general driving. That probably translates into low carbon emissions relative to the bigger cars. I know the Cayenne is the only Porsche polluter, and they are fixing that by making it a hybrid--along with that 4 dr sedan, probably.
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