The 2012 MINI John Cooper Works is available as a 2-door, 4-seat hatchback. Starting at $35,100, the 2012 MINI John Cooper Works Convertible is powered by a 1.6L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 33-mpg on the highway. The top of the line 2012MINIJohn Cooper WorksRoadster , priced at $ 34,500 , is powered by a 1.6L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 33-mpg on the highway.