Electric Motorcycles & Electric Bicycles

You'll be lucky. It was so easy that long ago, none of us can remember how to do such simple calculations on that simple a system. /s

It's a worthy goal, but you might find it's more involved than most of us have access to without specialist tools. I wish you luck. If you do find the tools, please share with us here.

The best model simulator for power controllers and motor simulations is PSIM:

https://powersimtech.com/products/psim/capabilities-applications/

However this is NOT free software and must be paid for !!

So if your enterprise is out to make money (which i am sure it is), then you must invest in *professional* tools in order to complete the task *professionally*.

Otherwise, simple current measurements during the maximum revolutions will give you some form of current draw. From there, you can either speculate on the energy drain (per hour) or simply run the batteries down to what you deem is 'empty' for the usage model(s).

For understanding a Control System application if there is some form of closed loop control, i recommend Simulink which is part of Matlab:

https://www.mathworks.com/solutions/electrification/motor-control.html