The 2013 BMW X6 is available as a 4-door, 4-seat sport utility. Starting at $59,800, the 2013 BMW X6 xDrive35i is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway. The top of the line 2013BMWX6xDrive50i , priced at $ 70,400 , is powered by a 4.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway.