Investigation ...6s1p or 4s2p, neu, cc neu...

[SpEEdyBL]

The biggest difference between a 4s setup and a 6s setup with theoretically equal power will be power lost as heat in the esc and wires (power loss = R*I^2), and therefore performance. Motor and battery temps will not be that much less with the 6s setup because, although you are drawing 2/3 the current, the equivalent motor for 6s will have (3/2)^2 times the internal resistance.

If you want a basic graph of motor efficiency, plot f(I) = (VI - R*I^2 - I0*V)/(VI) where V=volts, I=amps, R=internal resistance, I0= current at no load. That will give you the basic shape of a motors efficiency curve, but will not yield accurate efficiency values, due to voltage drop at the motor terminals, eddy currents and possible stator saturation at high currents. You can compare motors at different voltages though.