The 2009 Audi A6 (C6) Avant S6 5.2 FSI V10 Quattro tiptronic weighs 2045 Kg / 4508 lbs. What is the top speed of a 2009 Audi A6 (C6) Avant S6 5.2 FSI V10 Quattro tiptronic? The 2009 Audi A6 (C6) Avant S6 5.2 FSI V10 Quattro tiptronic top speed is 250 Km/h / 155 mph. Is 2009 Audi A6 (C6) Avant S6 5.2 FSI V10 Quattro tiptronic All Wheel Drive (AWD)? Audi A6 (C8) Allroad 50 TDI quattro Size, Dimensions, Aerodynamics and Weight. Wheelbase : 115.16 inches / 292.5 cm. Length : 194.92 inches / 495.1 cm. Width : AZ8UwXV.