I was driving to work this morning which is 135 miles from home. The temp was 40 degrees F and I kept the heat off as long as I could to eek out the miles to get to work. I was down to 51 ideal miles and 42 real miles when my toes were a little to icy so I turned on the heat and then hit the recycle air button. All of a sudden my ideal miles went up to 66 and my real miles went up to 57 respectively! It maintained the gain in miles and went down accordingly until I reached my destination. Any clue why this beautiful increase occurred???