Your motor has a sweet spot. Think of a bell curve in the middle of an x-y plot. Up the left is torque and across the bottom 0-30000 rpm. It converts current to torque the best right int he middle of the curve. So if the car spends most of its time or it averages in the middle of this curve the car will be most efficient. but you have gearing that makes a mess of things.

so you have to calculate the average speed and current required for a specific track with telemetry. Add up all the currents and speeds for a lap and divide by the number of samples and it will tell you your average speed requirement and current requirement. Then calculate the FDR you need to keep the motor average speed in the middle of the curve most of the time.

you can then set your throttle end point to control the max speed so that you dont creep into the bad side of the curve that generates too much heat.