The 2010 Pontiac Solstice is available as a 2-door, 2-seat convertible. Starting at $24,275, the 2010 Pontiac Solstice Base Convertible is powered by a 2.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway. The top of the line 2010PontiacSolsticeGXP Coupe , priced at $ 30,375 , is powered by a 2.0L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 29-mpg on the highway.