The 2018 Mazda Mazda3 is available as a 4-door, 5-seat sedan. Starting at $18,095, the 2018 Mazda Mazda3 Sport (M6) Sedan is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 28-mpg in the city and 38-mpg on the highway. The top of the line 2018MazdaMazda3Grand Touring (A6) Hatchback , priced at $ 24,945 , is powered by a 2.5L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 27-mpg in the city and 36-mpg on the highway.