Michelle and I have discussed this issue a number of times on the Morning Show. No conclusion was ever reached and while I like to take off immediately after starting the car, going slowly until the engine warms up, Michelle runs outside, starts the car and runs back in the house again, not to re-emerge until the car is toasty.
Curious about the right answer? I was too, so our Crack In-Search Of Team found this video which seems to clear the matter up. Not that "anyone" (and by "anyone" I mean Michelle) is going to change what she's already doing. And maybe she shouldn't.
photo YouTube Video