The 2007 BMW X5 is available as a 4-door, 5-seat sport utility. Starting at $45,900, the 2007 BMW X5 3.0si is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 23-mpg on the highway. The top of the line 2007BMWX54.8i , priced at $ 54,500 , is powered by a 4.8L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.