I feel like we’re losing context here. My comment wasn’t in reference to what I do, or what you do. It was in reference to what the root comment said they did.

The person in the root comment proposed that their practice of letting their ICE car warm up to defrost in the winter may lead to decreased gas mileage. This is correct; it will.

The reason I idle before driving is that even after I scrape the ice off, the wipers don't seem to be as effective until the window is warmer, and it's blurry and gets foggy. I try and scrape, wipe and antifreeze as much as possible, but I still find I can't see as well until the windows warm up a bit.