The 2009 Pontiac G6 is available as a 4-door, 5-seat sedan. Starting at $31,870, the 2009 Pontiac G6 Convertible is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 29-mpg on the highway. The top of the line 2009PontiacG6Value Leader Sedan , priced at $ 19,275 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway.