The current Audi S8 is incredibly fast for a full-size luxury sedan, capable of accelerating from 0 to 60 mph in just 3.8 seconds, thanks to its 563-horsepower twin-turbocharged V8 engine and the lightning-fast grip provided by the Quattro all-wheel-drive system. For buyers considering the Audi S8, that matters because it affects how easy the car is to live with, whether for commuting, family use, long-distance driving or ownership costs. The useful way to read this is not as an isolated specification, but as a clue to how the car will feel in real daily use.