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Audi-exclusive site Fourtitude compares spy shots of what's likely the Audi R8 supercar and the LeMans concept that inspired it. Amid all the geekery, the boys reveal one strange evidentiary bit: Several months ago, a "Gallardo" that "sounded like a diesel" had been spied during testing in Sant'Agata. Could it have been the R8? Could Audi's Sebring-winning diesel LeMans racer hearken the first diesel supercar? It's just conjecture, but when you think about it, it makes perfect sense.

R8 Production Car and Le Mans Concept Compared [Fourtitude]

Spy Photos: More of the Audi R8 Supercar [internal]