The 2011 Mazda CX-9 is available as a 4-door, 7-seat sport utility. Starting at $29,135, the 2011 Mazda CX-9 Sport FWD is powered by a 3.7L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway. The top of the line 2011MazdaCX-9Grand Touring AWD , priced at $ 34,535 , is powered by a 3.7L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.