This is a weird one. My '04 just exhibited very weird behavior. I have noticed the last few days that the hybrid battery seems to be losing charge over night and that was not happening when I first got the car (I have 2200 miles on it), nor does that seem to happen in my '03. Now, today I come back from a 40 mile freeway/city drive (and I did take note that the hybrid battery was about 2/3 charged when I pulled into the driveway) power the car off and go inside. I come out 3 hours later and find the power is on, the ICE is running and the hybrid batter is near zero. Hmmm... Weird enough that I wanted to know if anyone has seen/heard of such a thing.