The 2004 GMC Savana is available as a 3-door, 2-seat cargo van. Starting at $25,400, the 2004 GMC Savana Standard RWD G1500 Passenger is powered by a 4.3L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway. The top of the line 2004GMCSavanaAWD G2500 Cargo , priced at $ 27,155 , 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 18-mpg on the highway.