Interesting, is it the 7 speed auto? The manual usually is the one that struggles, for some reason the auto makes them get up and go a lot better. Is it the 2.5L 4cyl or the 3L V6 Diesel? Mates got a D22 with the 3L 4cyl Turbo Diesel manual, has reasonable power once the turbo kicks in and gets roughly 800km to a tank around town. Pretty good and reliable bus.