The 2015 Audi R8 is available as a 2-door, 2-seat coupe. Starting at $115,900, the 2015 Audi R8 4.2 (M6) quattro Coupe is powered by a 4.2L , 8 -cylinder engine mated to a manual transmission that returns an EPA estimated 11-mpg in the city and 20-mpg on the highway. The top of the line 2015AudiR85.2 Carbon (S tronic) quattro Spyder , priced at $ 199,600 , is powered by a 5.2L , 10 - cylinder engine that returns an EPA estimated 13-mpg in the city and 22-mpg on the highway.