My experience with hybrids is that if you are asking for cabin heat, they will be running the engine at initial startup.Interestingly enough our hybrid frequently never even starts the ICE at initial start up. Unless it’s pretty cold outside like this recent cold spell. Then the ICE will start immediately. But it frequently shuts off. Runs on batteries for a while and it starts back up again. Heck the first time the ICE may run in the morning is when we’re pulling out onto the small county hwy near our house. First start up if the ICE could be during that 0-55 mph acceleration. In that vehicle we have zero control over the ICE idling situation unless we hang out in the driveway forever waiting for the ICE to kick on. Spoiler: we don’t.
How many Toyota hybrid ICE’s are out there with high mileage doing fine in similar situations to suggest this waiting around business is a waste of time in relation to ICE longevity?
Hybrids are an interesting part of this conversation. My Accord and Prius hybrids both have an exhaust heat exchanger to warm the coolant quicker. Earlier Priuses used a coolant "Thermos". And I believe the Accord will force you to warm it up before moving if it gets too cold. And it won't start at all if it's extremely too cold.