The S8 can accelerate from 0 to 100 km/h (0 to 62 mph) in 4.2 seconds. It is powered by a 4.0-litre TFSI biturbo V8 engine with 382 kW (512 hp). The engine utilises cylinder deactivation so it can run as a V4 for better fuel economy. The S8’s engine is shared with the Bentley Continental GT, while a detuned variant of the engine makes 420 hp which is found in the 2013 Audi S6, Audi S7, and Audi A8. Direct competitors include the BMW Alpina B7 and Mercedes-Benz S63 AMG, which also have biturbo V8 engines.