The 2021 Audi A6 isn’t a crossover SUV. It’s a sedan, and that makes it a refreshing choice among mid-size luxury cars. The A6 is available as a sedan or wagon; with 4-, 6-, or 8-cylinder power; and can focus on practical luxury or wild power. It is mechanically related to the A7 Sportback, which may be considered to be yet another...
