I don't care how cold it is outside, I shut my car off while fueling up. IT'* not like it'* going to get that cold inside the car in the time it takes to gas up, and it won't take long for it to heat back up either.
one time though I had a gas station attendant wig out on me because after I was done fueling I ducked back into my car to check a text message, the attendant came out yelling at me because I was on the cell phone while people were fueling up and I was going to blow up the whole station
She got very irate with me when I told her it was more likely I would start a fire by starting my car up then by checking a text message on my phone INSIDE
my car. Should have seen the look on her face when I was driving away while she was still going on about what a danger I am and if she ever saw my doing that while at her station she would call the police