HELLO "AT": I use a Cycle Analyst ($95.)with the Crystalyte 500Whub laced into the 16"wheel on my BOB trailer, the CA and throttle are mounted on my ride. The CA records miles\Kms, watts, amps, speed etc. I use the hub mostly for hill assist and have achieved over 100Kms on a single charge (36V 10ah). With the CA I'm able to monitor the amount of watts I'm consuming, if I keep the watts around 100w-150w, I've been able to extend my range.