Hol' up, i got real world numbers on this motor.
30mph = under 1000w ( efficiency sweet spot )
45mph can happen on about 4000w with max effort pedaling and a massive chainring.
Motor will need some additional cooling help in order to hold 45mph for longer than a few miles. 40 mph for long stretches works, 27.5-30 mph is the sweet spot for range.
You WILL need dual torque arms on this motor, it's a beast. I don't recommend a 4T ( default winding ) unless you have a battery a lot more capable than what leafbike sells.
Beware this bike is a cop magnet and looks more like a motorcycle without a license plate than a bicycle. I wouldn't recommend going over 30mph and getting a massive enough chainring to pedal all the time ( >= 60T ) because this bike is high profile AF
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I wouldn't assume that, the 1.5kw motor is more like a 2kw motor in reality. Could be the same motor dimensions. Ask leafbike