Because of the charge taper it makes no sense to charge above 80% at Super Charger unless absolutely needed to get to the next stop or destination.It might be helpful to put a reminder on the SuperCharger page to charge and GO.
Charge to what you need to get to the next SuperCharger or destination and you will save trip time.
That usually would be charging from 15 - 60% and then GO. It is better for the battery and reduces overall trip time.
Charging over 80% in any 300 mile Tesla is usually a waste of time. Now if you have a smaller battery then your situation may be different. The SuperCharger page should have a recommendation on it for people to limit charge to 80% and GO.
This would help with thru put at SuperChargers.
Customer support service by UserEcho