There's nothing keeping someone from using the pedals w/ ~60lbs more w/ the right gearing, and it only adds ~10% more to the power requirements at 10mph and less the faster we go. The biggest killer IMO for using smaller lead acid batteries is cost w/ range coming in second. That said, I use to bike ~10-12 miles/day six days a week at ~12mph and having more than enough power to cruise through at the same speed w/ no pedaling would've been great some days.
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