The 2017 Mazda Mazda3 is available as a 4-door, 5-seat sedan. Starting at $18,895, the 2017 Mazda Mazda3 Sport (A6) Sedan is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 28-mpg in the city and 37-mpg on the highway. The top of the line 2017MazdaMazda3Grand Touring (M6) Sedan , priced at $ 23,145 , is powered by a 2.5L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 34-mpg on the highway.