I am away on vacation so I have limited time to the net, but I did want to mention that I hooked our "Trek" kid bike trailer to the strong and I pulled it and my 6 year old daughter over 6 km with no noticable drop in battery and not problem going up and down hills. So along with my 260 lbs plus her 40 lbs plus the trailer the Strong did well. It was cacual riding so no speed records but it was easy pulling with the motor.

As for my origianl 45 km run on one charge, remember this was over six trips at 6. 4 km each so the battery appears to "regain" energy when it sits for a bit. But most of that was with peddling and it is hard to say how much. But, I am still pleased witht he Strong and its performance so far.
Phil