The 2009 BMW X6 is available as a 4-door, 4-seat sport utility. Starting at $55,900, the 2009 BMW X6 xDrive35i is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway. The top of the line 2009BMWX6xDrive50i , priced at $ 66,650 , is powered by a 4.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 18-mpg on the highway.