Audi RS6 GTO concept Price in USA Starting From USD 230,000 to USD 239,000. The Audi RS6 GTO concept is a new 4 seater Wagon Car that comes with a 4.0L Twin-Turbo V8 Engine, and 850 nm Torque engine. Depending upon the variant and fuel type the Audi RS6 GTO concept has a mileage of 14 MPG.