The 2010 Audi A5 is available as a 2-door, 4-seat coupe. Starting at $36,000, the 2010 Audi A5 2.0T (M6) quattro quattro Coupe is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway. The top of the line 2010AudiA5quattro quattro Cabriolet , priced at $ 44,100 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 26-mpg on the highway.