The 2016 Audi S6 takes everything that’s right with the A6 sedan—elegant design, rich interior materials, and innovative technology—and adds a huge dollop of power. With a 450-hp, twin-turbo 4.0-liter V-8 and a seven-speed dual-clutch automatic, the engine offers cylinder deactivation for improved fuel economy. All-wheel drive and an adaptive air suspension help to harness all that power, making it a blast to drive in all types of weather. It’s pricey, but few cars combine excellence at so many levels.