Forget the smog-spewing, noxious-gas belching stereotypes. A whole new generation of cleaner diesel cars is on its way to showrooms, with Volkswagen, BMW, and Mercedes-Benz all offering 2008 models in the United States. To prepare for the forthcoming wave of oil-burners, we got our hands on a diesel-powered European-spec Audi A6 and put it through some rigorous testing to see how it measures up to its gasoline counterparts.
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