So the other morning on the way to work I thought of a question. On the Hybrid Malibu how long does it take to start generating heat in stop and go traffic? I thought of it because I was behind a Hybrid Camry and saw that the engine was not on at some points in time. It was -4 F out and it took a while for my Avalanche to start kicking out heat. I think I have read that other Hybrid vehicles (Prius comes to mind) use a thermos type container to hold some hot coolant so you get heat pretty quick. I guess it is possible that they may have designed it so that the vehicle keeps the engine running until it has warmed up but I was just curious how it works.