The 2007 Pontiac Solstice is available as a 2-door, 2-seat convertible. Starting at $21,515, the 2007 Pontiac Solstice Base is powered by a 2.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway. The top of the line 2007PontiacSolsticeGXP , priced at $ 26,515 , is powered by a 2.0L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 22-mpg in the city and 31-mpg on the highway.