My dad used to tell me to do the same thing, but unless your car is old enough to have a carburetor, experts actually recommend against idling your gas or diesel-powered car to warm it up, unless you just really want to drive a toasty car.
If your car is electric or a plug-in hybrid, on the other hand, you should warm it up in the winter. This is because running the heat can really sap the power in your electric car’s battery, so getting it all nice and warm while it’s still connected to grid power will ensure you don’t shorten your driving range.
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