The 2007 Buick Terraza is available as a 4-door, 7-seat passenger van. Starting at $26,660, the 2007 Buick Terraza CX is powered by a 3.9L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway. The top of the line 2007BuickTerrazaCXL , priced at $ 30,780 , is powered by a 3.9L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway.