The 2015 Porsche Boxster is available as a 2-door, 2-seat convertible. Starting at $51,400, the 2015 Porsche Boxster Base is powered by a 2.7L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 30-mpg on the highway. The top of the line 2015 Porsche Boxster GTS, priced at $73,500, 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 26-mpg on the highway.