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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 latest episode in the embargo follies comes from Germany's Auto Motor und Sport. They have revealed that Audi will be dropping the diesel V-12 from last years Q7 V-12 TDI into the R8 sports car for the Detroit Auto Show. Audi is obviously looking to capitalize on the racing sucess of the R10 LMP1 car in the American Le Mans Series and the 24 Hours of Le Mans. The V12 has 500hp and a tire-shredding 738lb-ft of torque. It's unlikely that the V-12 will ever appear in a production R8 but Audi's