I have regen set at 250 for the last 4 weeks and can drive without using brakes much. I must say I don't notice a significant extra range.
It would be interesting if Kenneth knows with the regulator how much energy can go back to the batteries. For instance anything above 200 just cannot be absorbed by the battery as only 2k
w/10amps will be accepted. The same for foot braking which I suspect would have a high ampage that only 30% actual can be accepted for the very short time using it.
Far better to free ride in my experience and balance the throttle between the in/out arrows.
I will lower my settings today and see what difference it makes.