I have experienced the engine racing also, at least twice since I bought the car in October. Today I was driving on a secondary road when it started (while in HV mode); didn't last as long as before, only about 30 seconds, but the engine was absolutely screaming, as if I had pushed down on the gas without releasing the clutch in a manual shift car. This can't be good for any engine. I don't buy the explanation that the engine is only lubricating itself; it should not have to rev so much to accomplish that. I wonder if the continuously variable transmission belt is slipping? Plus, I've always wondered why the engine must rev to a smaller extent whenever the engine turns on. What is the purpose of that? My old C-Max hybrid never exhibited any engine racing. I wonder if there are any Honda engineers watching this forum who could provide technical explanations for the Clarity's behavior.