The 2020 BMW X6 M is available as a 4-door, 5-seat sport utility. Starting at $108,600, the 2020 BMW X6 M Base is powered by a 4.4L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway. The top of the line 2020 BMW X6 M Competition, priced at $117,600, is powered by a 4.4L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway.