I have recently bought a 2007 model and it has relatively low millage at 50K. I have noticed when breaking and accelerating, and the hybrid motor kicks in and out, there is a high pitched electrical noise. It s not very loud and you have to tune our ears in to hear it, but once you have you become quite aware of it. Is this normal? My wife has a RX Hybrid and I don't notice a similar high pitched whine on her car. I don't want to take it back to the Lexus dealer for him to say its normal!