OK, I'll bite. What kind of car?
In modern stuff - like my minivan or altima - Start and go. Maybe let it warm up enough to actually blow hot air with the heater, but then I can leave my car out running in my yard and not worry about someone liberating it. In my P-car (4 cyl aircooled) I warm it up enough to no be stuttering and stalling, and to respond nicely to the gas pedal. Then I "aggressively" warm it up on the roads
... too bad I don't have heat and I do have LOTS of airflow. On the other hand, it only gets down to high teens at the worst, and only occasionally at that here in N. Florida