Interesting - I just found this post today while trying to figure out what was wrong with my 2010 FFH. Exactly the same symptoms happened to me - I called the dealer but their service department hadn't heard of this behaviour. After fully charging the battery the conditioning cycle was done and we're now getting much more range on pure electric than before. However, the computer should put up a message to say that it's OK and normal and not to worry that the engine is going to run for a bit and that the regenerative breaking is disabled. The transition is a bit alarming.