Photos: Prototype concept cars

While some concept cars look like they come from a future that never will be, others represent cars that will actually go into production. We've gathered the most realistic concept cars from the last auto show season here to see how the near future will look.

Audi R8 V12 TDI concept

The current, gasoline-fueled V-8 R8 has proven a sales success for Audi, with demand outstripping supply. And with the new popularity of diesels and the fact that Audi has all the parts, the move to produce an R8 powered by a V12 turbo diesel shouldn't be too hard of a decision.

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