The 2012 BMW X3 is available as a 4-door, 5-seat sport utility. Starting at $37,100, the 2012 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 2012 BMW X3 xDrive35i, priced at $42,700, 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.