The 2004 Mazda Mazda3 is available as a 4-door, 5-seat sedan. Starting at $17,515, the 2004 Mazda Mazda3 s (A4) Sedan is powered by a 2.3L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 29-mpg on the highway. The top of the line 2004MazdaMazda3(A4) Hatchback , priced at $ 18,005 , is powered by a 2.3L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 29-mpg on the highway.