Competing in the midsize sedan segment, the 2018 Audi S6 Sedan is a direct competitor to the BMW M550i, the Lexus GS F, and the Cadillac CTS-V Sport. The S6 starts off at an MSRP of $71,900, going all the up to $74,400, with 2 trims in the lineup. Each trim is offered with a 4.0L Twin-Turbo V8 engine and a 7-speed dual-clutch automatic transmission, producing 450 horsepower and 406 lb-ft of torque. Through this powertrain, the S6 manages a 0-60 of 3.9 seconds and a combined fuel economy of 18 MPG.