BL motors and load

I understand what you're saying othello, but that raises another question. Why do brushless motors have a best efficiency range under a given load?

Or furthermore; what is affecting the efficiency throughout the RPM and power band?

My guess is that startup of a brushless motor means a high current draw to initially get moving. Once you are already moving though, it takes a fraction of the current to keep the motor going, and it also takes a fraction of the startup current to go from say 30,000 RPM to 40,000 RPM. Am I on to it or no?