The 2008 Audi R8 is available as a 2-door, 2-seat coupe. Starting at $109,000, the 2008 Audi R8 (M6) is powered by a 4.2L, 8-cylinder engine mated to a manual transmission that returns an EPA estimated 13-mpg in the city and 20-mpg on the highway. The top of the line 2008 Audi R8 Base, priced at $118,000, is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway.