yes, I know the graph comes from the VEX website. What I mean’t is that I don’t know who inside VEX created it and whether it’s just a theoretical curve or if measurements were made on a motor (which I doubt). With a typical DC motor performance graphs generally look like this.
They are usually created using known parameters of the motor, stall torque, stall current and no load current. It’s possible to measure these parameters with a DC motor even if they are not known. But the V5 motor has firmware between the input values you give it and the drive to the actual motor, so creating that type of graph for a V5 motor is harder.