The 2005 Mazda Mazda3 is available as a 4-door, 5-seat sedan. Starting at $18,005, the 2005 Mazda Mazda3 s (A4) Hatchback 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 2005MazdaMazda3sp23 (A4) Hatchback , priced at $ 19,585 , 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.