The 2020 Audi A5 is available as a 2-door, 4-seat coupe. Starting at $42,900, the 2020 Audi A5 quattro Coupe is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 32-mpg on the highway. The top of the line 2020AudiA5quattro Sportback , priced at $ 42,900 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 32-mpg on the highway.