The 2021 Mazda Mazda3 is available as a 4-door, 5-seat sedan. Starting at $20,650, the 2021 Mazda Mazda3 2.0 FWD Sedan is powered by a 2.0LL , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 28-mpg in the city and 36-mpg on the highway. The top of the line 2021MazdaMazda3Premium Plus Package AWD i-ACTIV AWD Hatchback , priced at $ 33,900 , is powered by a 2.5LL , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway.