The 2009 Pontiac G5 is available as a 2-door, 5-seat coupe. Starting at $16,980, the 2009 Pontiac G5 Base is powered by a 2.2L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 37-mpg on the highway. The top of the line 2009PontiacG5GT , priced at $ 20,280 , is powered by a 2.2L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 35-mpg on the highway.