The 2007 Chevrolet TrailBlazer is available as a 4-door, 5-seat sport utility. Starting at $25,045, the 2007 Chevrolet TrailBlazer LS 4x2 w/1SA/1SB 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 22-mpg on the highway. The top of the line 2007ChevroletTrailBlazerw/3SS AWD , priced at $ 37,125 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 17-mpg on the highway.