The 2011 BMW X3 is available as a 4-door, 5-seat sport utility. Starting at $36,750, the 2011 BMW X3 xDrive28i 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 25-mpg on the highway. The top of the line 2011BMWX3xDrive35i , priced at $ 41,050 , 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 26-mpg on the highway.