This coupelike sporty SUV is based on the smooth and capable X5, which is a good place to start. Unlike its sibling, the styling severely hampers rear visibility, cabin access, and cargo room in the X6. More than just a new body, though, the X6 is sportier than the X5, with tauter handling and a slightly stiffer ride. Most versions are powered by a 3.0-liter, turbocharged six-cylinder, which returned 21 mpg overall in our tested X5. A 4.4-liter turbocharged V8 is also offered. The interior is luxurious and well crafted, and the seats are supportive for long trips. Some controls, however, take time to master. A rear-wheel-drive version is available.