Sporting revised exterior and interior styling, the 2013 Audi S4 is a compact luxury sports sedan variant of the A4. The S4 is powered by a 3.0-liter turbocharged V6 engine that produces 333 hp and 325 lb-ft of torque, for a 0-60 time of 4.9 seconds. The permanent AWD drivetrain can be paired with either a standard 6-speed manual transmission or optional 7-speed dual-clutch automatic transmission. Fuel mileage falls within an EPA estimated range of 18 mpg city to 28 mpg highway, depending on transmission selection. Features include sports rear differential, adaptive xenon headlights, LED turn signals, LED taillights, 19-inch alloy wheels, carbon fiber inlays, heated front seats, leather seats with Alcantara® inserts, sunroof with sliding functions, three-zone automatic climate control, iPod®/iPhone® integration, navigation system, and 14-speaker sound system. Safety is comprised of parking sensors, dual-stage front airbags, side thorax airbags, head curtain airbags, electronic stability control, electronic brake distribution, anti-lock braking, and brake assist. The S4 is backed by a 4-year/50,000-mile warranty.