I will always charging to 100% regardless if somebody else is waiting or not. At first at all BYD Manual tells you that you should charge to 100% at least once a week for Balancing, second a round Trip to a Rever Charger is 50 km for me (probably like for many others), third even if I had to pay for the last 20 percent I would keep on charging as once done the Battery is full again. And last but not least I doubt people would charge the remaining 20% at home, they just would come 20% more often to the Charger to bring it up to 80% again. This would significantly extend the waiting Lines.