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Nobody is going to argue that the Audi R8 diesel will be saving the earth. It won't. But, like the Tesla Roadster, a diesel version of the awe-inspiring Audi supercar could go a long way towards convincing consumers that diesels don't have to be smelly, dirty, noisy and slow. Chances are that the Audi's V12 diesel won't be making it behind the passenger compartment of the R8, but rumor has it that a 4.2 liter TDI V8 might. Yes, please ... and why not fill it up with biodiesel while we're at it.

The 12 Hours of Sebring endurance race is going on this weekend in central Florida and Audi has a major presence their with the defending champion R10 TDI sports car. The LMP1 racers are not however the only Audis on hand with a diesel V-12 engine. The R8 V-12 TDI that was one of the stars of the Detroit Auto Show is also on hand and Audi is allowing some journalists to take some gentle laps in the concept. The reason the laps are gentle is because the R8 may have a monster 500hp 737lb-ft diesel