The 2004 Mazda B3000 is available as a 2-door, 3-seat regular side. Starting at $19,205, the 2004 Mazda B3000 (A5) Regular Cab is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 22-mpg on the highway. The top of the line 2004MazdaB3000(A5) Cab Plus 4 , priced at $ 21,085 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 22-mpg on the highway.