2015 Audi S6

The 2015 Audi S6 is a 4-door, 5-seat Sedan, available in 1 , the Base. Upon introduction, the $75,500 Base is equipped with a standard 4.0L, 8-cylinder, engine that achieves 17-mpg in the city and 27-mpg on the highway. an Automatic transmission is standard. The $75,500 Base is equipped with a standard 4.0L, 8-cylinder, engine that achieves 17-mpg in the city and 27-mpg on the highway. an Automatic transmission is standard.