The 2018 BMW X4 is available as a 4-door, 5-seat sport utility. Starting at $47,600, the 2018 BMW X4 xDrive28i is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway. The top of the line 2018BMWX4M40i , priced at $ 59,250 , 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 25-mpg on the highway.