The 2019 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $58,900, the 2019 Audi A6 55 is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 29-mpg on the highway. The top of the line 2019AudiA645 , priced at $ 54,100 , 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.