The 2023 Audi RS 5 is available as a 2-door, 4-seat coupe. Starting at $77,900, the 2023 Audi RS 5 quattro Coupe is powered by a 2.9LL , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway. The top of the line 2023AudiRS 5quattro Sportback , priced at $ 78,200 , is powered by a 2.9LL , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway.