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 2004 Chevrolet TrailBlazer LS 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.