2017 Mercedes-Benz GLS-Class: The 2017 Mercedes-Benz GLS-Class replaces the GL-Class. This seven-seat luxury SUV competes with vehicles such as the Audi Q7, Cadillac Escalade, and GMC Yukon Denali.The GLS-Class offers a 3.0-liter twin-turbocharged V6 that makes 362 horsepower, a twin-turbocharged 4.7-liter V8 that makes 449 horsepower, and a 5.5-liter twin-turbocharged V8 that makes 577 horsepower. The former two engines mate to a nine-speed automatic, while the latter pairs with a seven-speed automatic. There's also a 3.0-liter V6 turbocharged diesel that makes 255 horsepower. The GLS-Class has all-wheel drive and EPA-estimated fuel economy numbers ranging from 13 mpg to 22 mpg highway.Available features include leather upholstery, infotainment system, heated front seats, USB, and navigation.Available safety features include rear-view camera, blind-spot assist, lane-keep assist, traction control, anti-lock brakes, stability control, and dual-front and side-curtain airbags.The 2017 Mercedes-Benz GLS-Class has a base price of $67,050, not including fees.