The 2009 Mazda B4000 is a 4-door, 5-seat Regular Side, available in 2 trims, ranging from the (M5) to the (A5). Upon introduction, the $22,150 (M5) is equipped with a standard 4.0L, 6-cylinder, engine that achieves 15-mpg in the city and 19-mpg on the highway. a Manual transmission is standard. The $23,150 (A5) is equipped with a standard 4.0L, 6-cylinder, engine that achieves 14-mpg in the city and 18-mpg on the highway. an Automatic transmission is standard.