[FRSBRZGT86FAN]

Just a force of habit, in a non frs/brz vehicle, after a cold night before school or work in the morning, I just turn the car on 10 min before I leave just to get the heat going, gets all the fluids going too. I also know that catalytic converters work better when warm anyway so you are slightly helping emissions But general idea is "baby" it till normal temps then do what you want, common sense tells you engines warm up better under a light load than just idling for a couple minutes.