If it makes you feel better, I keep doing the same.
Also, I rented a car through work and drove 3 hours to a meeting with a coworker. The car had a fob and was brand new (Chrysler 300). We went in to the meeting and came back out and were standing near the car talking and somebody leaned up against the car and said "Hey, this car is running!". Sure enough, I left it running 4 hours, it burned 3/8 of a tank of gas sitting there. Did I mention it was 95 degrees? I got in and looked at the temp gauge and it was fine. The car was nice and cool because the temp was set to 75 or so and it kept it there the whole time. Man, I got some guff about that, still hear about it.