The 2011 BMW Z4 is available as a 2-door, 2-seat convertible. Starting at $47,450, the 2011 BMW Z4 sDrive30i (M6) is powered by a 3.0L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 18-mpg in the city and 28-mpg on the highway. The top of the line 2011 BMW Z4 sDrive35is (A7), priced at $62,500, 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 24-mpg on the highway.