I usually try to avoid any excess idle and get going as soon as possible. When the weather is below 10*C (50F) I will use the block heater.
During winter I will also use the car interior pre-heater to defrost the windows.
If it is not possible to use any preheating and the windows are covered with ice, I will start the engine and put on the defrosting and scratch the windows clean within 2 minutes and get going.
Safety comes always first. You must see where you are going.
In Finland we have a law that prohibits any idling longer than 2 minutes.
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Summer vehicle
My dad's tire pressure is much higher than your dad's!
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