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The 2015 Audi A6 is a solid contender in the mid-size luxury segment–competing most readily with the BMW 5-Series, Mercedes-Benz E-Class, and Cadillac CTS–but some of the greatest competition comes within its own brand, thanks to a very sleek Audi A7, and a slightly more affordable Audi A4. The A6 and performance-oriented...
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