I realize that a lot of folks don't use the electric heat, but I found out something I'd not noticed before. When running in EV and using the heater, the temperature gauge shows how warm the electric heat lines are. The temperature rises just like it was monitoring the ICE. When switching to ICE on the freeway, it reverts to normal monitor of the ICE temp.
Not a huge thing, but one of the first new things I've seen in a long time.