The 2007 Porsche Boxster is available as a 2-door, 2-seat convertible. Starting at $45,600, the 2007 Porsche Boxster Base (M5) is powered by a 2.7L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 32-mpg on the highway. The top of the line 2007 Porsche Boxster S (M6), priced at $55,500, is powered by a 3.4L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway.