7. Audi R8 V12 TDI
Audi held the world premiere of the Audi R8 V12 TDI diesel engine concept car to the world automotive media during the press preview days at the North American International Auto Show in Detroit, Michigan. The NAIAS is the world's largest auto show.
Image: The Audi R8 V12 TDI diesel engine concept car | Photograph: Bryan Mitchell/Getty Images
Also read: 10 things to know about Jaguar-Land Rover
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