I'm getting the opportunity to drive the University of Manitoba's PHEV Prius on Wednesday. It's for a fuel economy rally and I want the car and technology to have a good showing so need to learn some basics on how to drive it. I got a quick demo of the car and it does not have any way to force the car into an EV mode. I figure I'll have to give the car a good warm-up before going out. How fast can I go before the ICE fires up? Any other tips the PHEV or Prius experts have to offer would be greatly appreciated. Thanks.