The 2004 Ford Explorer Sport Trac is available as a 4-door, 5-seat sport utility. Starting at $23,710, the 2004 Ford Explorer Sport Trac XLS (110A) 4x2 is powered by a 4.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway. The top of the line 2004FordExplorer Sport TracAdrenalin (240B) 4x4 , priced at $ 30,980 , is powered by a 4.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway.