The Mercedes-Benz GL63 AMG is the largest vehicle produced by Mercedes-Benz and weighs more than 5,500 pounds. The most powerful SUV produced by the company at 550 HP, the GL63 AMG is rated at a top speed of 155 MPH that is electronically controlled. The auto features a 5.5 liter, turbo-charged, eight cylinder engine that can go from zero to 60 MPH in under 4.8 seconds which helps it compete with many sports cars on the market. The vehicle features a seven-speed, automatic transmission that includes re-matching on the downshifts, an improved suspension, steer, brakes, and all-wheel drive. The fuel economy of this SUV is on the lower end of performance at 12 MPG city / 16 MPG highway; however, its braking distance is superb with being able to stop the vehicle from 70 MPH to stop in approximately 160 feet.