I used to work in the Northwest Territories and when it's -40c or colder we never shut our trucks off untill we were at home. You always carried a second set of keys so you could leave it running while in the mall. Once we got home, we would plug in the block heater to keep it warm.
We also had remote starters on our trucks.
Now I just fire it up, wait a half minute and then drive easy for a few kilometres. Letting a vehicle warm up for more than a couple of minutes is not requred.
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