The Audi A7 is a mid-size four-door luxury car that's closely related to the Audi A6 sedan. The distinctiveness of its sloping fastback roofline puts it in a relatively exclusive group of design standouts—like the Porsche Panamera, Acura ZDX, BMW 5-Series Gran Turismo, and Mercedes-Benz CLS Class. And whether you call these fastbacks...

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