The 2010 S6 is a 4-door, 5-passenger sports car, obtainable in one trim only, the car. Ahead preface, the S6 is prepared with a standard 5.2-liter, V10, 435-horsepower engine that attains 14-mpg in the city and 19-mpg on the highway. A 6-speed automatic transmission with overdrive is ordinary.