The A8 is the king of Audi’s luxury sedans, packed with tech including autonomous driving features and luxury options—including a foot warmer for rear-seat passengers. A 335-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 system scans the road for imperfections and adapts the suspension to absorb them. A 449-hp plug-in hybrid with inductive charging arrives in 2019.