C/D SAYS: Few cars blend luxury and performance quite like the 2023 Audi S8, which pumps up the humble A8's pace with a 563-hp twin-turbo V-8. Learn More EXPAND ALL MODEL YEARS And even in Quattro guise and with taller final-drive gearing, the diesel clobbers the gas car to 60 mph, hitting the mark in 5.1 seconds, a half-second quicker than the last A6 3.0T we tested. 7gUPzw1.