On the trip meter inside my model S it says I have used a total of 444 kWh for the entire time I have owned the car. About 90% of my charging happens at work through a ChargePoint station. ChargePoint says I have charged through them for a total of 500 kWh. How do I reconcile these numbers? When I got the S it was already 90% charged plus I do some charging at home and my current battery is only at 40%. I can't think of any reason the ChargePoint number should be higher. The charger is free at work so I am not worried about getting ripped off. I am just curious to understand what I am missing here. Some sort of electricity loss between the charger and my battery?