45mph, ha! These can go to around 60 if you really push them to! also D7e might be better, it has 290hp and is euro 4 compliant, I know that came to the B7RLE-60 but not too sure about the B7TL. (edit i don't think it ever did) Voiths had more power than ZF's though, to compensate lack of gears. Also for this we need viscous fan simulation lovely noise: I love the way it builds up, fan slowly revs up, then reaches full speed, turbo comes in, engine revs soar, fan sticks at full speed and the bus goes through the gears like a bat out of hell!