The 2020 Audi A6 is available as a 4-door, 5-seat sedan. Starting at $59,800, the 2020 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 2020 Audi A6 45, priced at $54,900, 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.