The 2012 MINI Cooper S is available as a 2-door, 4-seat hatchback. Starting at $27,950, the 2012 MINI Cooper S Convertible is powered by a 1.6L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 27-mpg in the city and 35-mpg on the highway. The top of the line 2012MINICooper SRoadster , priced at $ 27,350 , is powered by a 1.6L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 27-mpg in the city and 35-mpg on the highway.