The 2005 Pontiac Grand Am is available as a 4-door, 5-seat sedan. Starting at $22,500, the 2005 Pontiac Grand Am GT is powered by a 3.4L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway. The top of the line 2005PontiacGrand AmSedan , priced at $ 20,090 , is powered by a 2.2L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 25-mpg in the city and 34-mpg on the highway.