The 2014 Audi S4 is a 4-door, 5-seat Sedan, available in 2 trims, ranging from the (M6) to the Base. Upon introduction, the $48,100 (M6) is equipped with a standard 3.0L, 6-cylinder, engine that achieves 17-mpg in the city and 26-mpg on the highway. A Manual transmission is standard. The $49,500 Base is equipped with a standard 3.0L, 6-cylinder, engine that achieves 18-mpg in the city and 28-mpg on the highway. An Automatic transmission is standard.