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 2004 Mazda B3000 (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.