jmueller065 wrote:It is very possible that no one has had the car long enough to notice any loss of charge....
This is most likely the case. Think about what the car is primarily designed for, i.e. a low mileage daily commuter. People aren't racking up hundreds of miles a day on these things, nor have they been around in quantity for any length of time. There's just over a 1000 of these cars "in the wild" and most of those have been in the last 6 months or so.
Low daily mileage * very few days * very few cars = very little to go on.
There just isn't enough data to be had out there right now to make any conclusions about this. Yet.