From the EV community my experience is that the Volt drivers have the worst charging behavior. Frequently I see volts blocking a Chademo parking space . Then there are those who block a Level 2 forever. Volts should charge at L1 and not blocking an 80 Amp charger for 4 hours just to get a few KW. And than there is this stupid car "feature" that the alarm goes on if one unplugs a CHARGED car. I really hope that all those new "plug in hybrids" will fail, otherwise we see more and more of chargers blocked by those cars who have a tiny battery with a tiny charger.