The 2004 Chevrolet TrailBlazer is available as a 4-door, 5-seat sport utility. Starting at $30,020, the 2004 Chevrolet TrailBlazer LT 4x2 is powered by a 4.2L , 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 2004ChevroletTrailBlazerLS 4x4 , priced at $ 29,770 , is powered by a 4.2L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.