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The five-seat Audi A6 is a mid-size luxury sedan that bridges the gap between the smaller A4 and full-size A8. Engines range from mild to wild, with the S6’s 444-horsepower, turbocharged 2.9 ...

When Audi introduces ... the big sedan is said to be good for a hugely fast 4.2-second sprint to 62 miles per hour and an electronically limited top speed of 155 mph. The S6 and S7, meanwhile ...