The 2012 Porsche Boxster is available as a 2-door, 2-seat convertible. Starting at $48,100, the 2012 Porsche Boxster Base is powered by a 2.9L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway. The top of the line 2012PorscheBoxsterBlack Edition , priced at $ 65,200 , is powered by a 3.4L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.