My employer offers a few EV charging spots, but the only power outlets available are 5-15/5-20, and 6-20. There is only one of the latter. I plan on going to the nearby service center today to see if they have any 5-20 and/or 6-20 adapters for my mobile charger, but when looking around at various charging rate comparisons, I don't see much difference between charging at 5-15 and 5-20. Should I even bother with the 5-20 connector, or does the extra amperage actually help with any significance in comparison to the standard outlet's trickle charge?