Turn off the power to the engine but leave the stereo on? Just want to finish listening to a favorite song. Do I need to power down and then immediately power back up with my foot off of the brake? Had my prius 4 weeks now and can't imagine buying anything else.
Yes, just leave it ON. Let it manage its own energy. It's not like a conventional car, the penalty for staying ON for a few more minutes while not moving is trivial. Besides, there's no way to get from ON to IG-ON or ACC without interrupting the song. The only time you should not leave it ON is when you're in a completely enclosed space with no provision for removing the exhaust.