The A8 is the pinnacle of Audi’s luxury sedans: packed with tech including autonomous driving features, and redolent with luxury options—even a back-seat foot warmer. A 340-hp turbocharged 3.0-liter V-6 is standard; a 460-hp twin-turbo 4.0-liter V-8 is optional. All-wheel drive, an eight-speed automatic, and air suspension are standard. An optional suspension system scans the road for imperfections, adjusting to soak them up. A 449-hp plug-in hybrid with inductive charging is in the works.