The 2011 Audi A6 returns for a final model year before its replacement shows up in U.S. dealers. It’s still attractive, and attractively priced, but the A6 is less spacious and less distinctive than the likes of the Infiniti M37 and M56, the Mercedes-Benz E-Class, and the BMW 5-Series and 5-Series GT. The A6 comes as a four-door sedan or...
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