The BMW xDrive50i is one of the fastest BMD models of SUV that has not been modified by the M division of the company. The SUV features a twin-turbo, eight cylinder engine that is rated at 445 HP and 480 lb-ft of torque. The xDrive50i can go from zero to 60 in 4.3 seconds, and is capable of towing just about any load you might need in the automobile. The SUV’s cabin is extremely quiet and the X5 xDrive50i has an excellent braking system to help instill driver confidence at high speeds. The third row of seats of the auto is rated as difficult to access by consumers and not comfortable. Overall, the X5 xDrive50 sees an EPA fuel economy of 15 MPG city / 22 MPG highway.