The 2009 GMC Sierra 1500 is available as a 2-door, 3-seat regular side. Starting at $33,395, the 2009 GMC Sierra 1500 SL 4x4 Crew Cab is powered by a 4.8L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 18-mpg on the highway. The top of the line 2009GMCSierra 1500Xtra Fuel Economy 4x2 Crew Cab , priced at $ 33,275 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway.