The 2008 Audi A5 is available as a 2-door, 4-seat coupe. Starting at $39,900, the 2008 Audi A5 (M6) is powered by a 3.2L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 27-mpg on the highway. The top of the line 2008AudiA5(A6) , priced at $ 41,200 , is powered by a 3.2L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 27-mpg on the highway.