A high performance edition of the Audi A6, dubbed the S6, is also available. The S6 features all-wheel drive and a 6-speed automatic Tiptronic transmission matched with a 435 horsepower, 5.2 liter V8 that also cranks out an impressive 398 lb-ft of torque. Fuel economy is a predictably low 14 miles per gallon in city driving and 19 miles per gallon during highway cruising.