Today was cold again. I started the car with remote start for about 5 minutes. I parked the car with the gauge showing about 50mpg. When I got in it showed 45mpg. However, the car was warmed up and I was able to get 55mpg on my way in to work today. Is it possible that I use more gas to propel my car for the first 5 minutes when it is cold than I do when I let it idle 5 minutes and drive an additional 5 minutes with a warm engine? One thing to note is the first 5 minutes has me hitting about 8 stop lights and signs where I'm going to be idle anyway and with my warmed up car I can get the auto-stop to kick in after the first 5 so for 3 signs where I would normaly be idle I am actualy shut off. I relize I could turn the car off at all stops but my battery seems to be dropping low when I do that (I have a very large stereo system that is a huge drain on my battery).