Fuel economy:17 cty/27 hwy
What's New for 2015 For the 2015 Audi S6, the standard xenon headlights have been replaced with LEDs, and the previously optional head-up display is now standard as well.
Fuel economy:18 cty/27 hwy
What's New for 2016 For 2016, the S6's twin-turbocharged V8 receives a 30-horsepower boost, while the MMI infotainment system gets a faster processor, dual USB ports, additional online services and 4G LTE connectivity. The S6 also gets some very minor styling tweaks (including reshaped headlight and taillight elements), and a sport exhaust is now included in the S6 Sport package.