For the sprint from rest to , the S6 saloon takes 5.2 seconds, with the quarter mile passing in 13.5 seconds. Top speed is electronically limited to . However a test by Edmunds found that the S6 takes 5.7-seconds to reach , a full second or so behind the BMW M5 and Mercedes-Benz E63 AMG (which are the S6's closest competitors in North America, since the RS6 is not sold there), and that the 2009 Audi A6 3.0 TFSI (a supercharged 3.0L V6) has almost equivalent performance to the S6 5.2 FSI. Yet, in a 2007 track test by Road & Track, the C6 S6 went from in 5.1 seconds, while it covered the quarter-mile in 13.5 seconds. Despite its heft at 4,500 pounds, the S6 has quick reflexes and agility, with the assistance of Audi's quattro system.
