The 2007 Mazda MAZDASPEED6 is available as a 4-door, 5-seat sedan. Starting at $29,925, the 2007 Mazda MAZDASPEED6 Grand Touring is powered by a 2.3L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 25-mpg on the highway. The top of the line 2007MazdaMAZDASPEED6Sport , priced at $ 27,995 , is powered by a 2.3L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 25-mpg on the highway.