The 2015 BMW X6 is available as a 4-door, 5-seat sport utility. Starting at $61,900, the 2015 BMW X6 xDrive35i AWD is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 27-mpg on the highway. The top of the line 2015BMWX64x2 , priced at $ 59,600 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.