The 2006 Mazda B4000 is available as a 4-door, 5-seat regular side. Starting at $21,895, the 2006 Mazda B4000 Base (M5) is powered by a 4.0L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 19-mpg on the highway. The top of the line 2006 Mazda B4000 Base (A5), priced at $22,895, is powered by a 4.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 19-mpg on the highway.