I always let my car warm up a bit. I don't really like the way it runs when its cold. From what i've read its bad to rev past 3k while your engine is cold. I've noticed that i have a huge decrease in mileage when i warm up my car during winter. So its either drive on a cold engine and cause wear or let it warm up and have sh*tty gas mileage?
What are your guys thoughts on this?