► 2015 Audi S6 Sedan test drive (Good Exhaust Sound)

The 4.0 TFSI, a biturbo V8 producing 331 kW (450 hp), accelerates the Sedan from 0 to 100 km/h (62.1 mph) in 4.4 seconds. The Audi S6 Avant completes the sprint in 4.6 seconds. Average fuel consumption is just 9.2 liters per 100 kilometers (25.6 US mpg) in the Sedan and 9.4 liters (25.0 US mpg) in the Avant, the equivalent of 214 and 219 grams CO2 per kilometer (344 and 352.4 g/mi), respectively. This efficiency is due in large part to the cylinder on demand (COD) system, which only activates four of the ei