MPG City: 17 ; Highway: 27
Fortified with a 520-horsepower, twin-turbo 4.0-liter V-8 engine, the S8 is the hot rod of the A8 line. It comes with an eight-speed automatic transmission, all-wheel drive, adaptive suspension and driver-selectable settings for the steering and suspension. Rivals include the Mercedes-Benz S63 AMG and BMW Alpina B7.Side-by-Side Comparison
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