The Audi A8 is the automaker's flagship sedan. While a standard model is offered in other markets, only the long-wheelbase variant of the A8 is available in the U.S.

The long-wheelbase version of the A8, the A8L, is now slightly longer than the BMW 7-Series, Lexus LS or Mercedes-Benz S-Class, bringing an exceptionally roomy interior. The A8 still manages to feel ...