The 2004 Mazda B2300 is available as a 2-door, 3-seat regular side. Starting at $15,125, the 2004 Mazda B2300 (M5) Regular Cab is powered by a 2.3L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 24-mpg in the city and 29-mpg on the highway. The top of the line 2004MazdaB2300Cab Plus , priced at $ 18,925 , is powered by a 2.3L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 24-mpg in the city and 29-mpg on the highway.