I don't know why it took me this long to consider this, but I started keeping the A/C on 72F and the fan on the lowest setting, instead of using the Automatic Climate control. My last fill-up was at 49.1mpg, and my current tankful with 300+miles is sitting at 48.4mpg. Does using the automatic climate control really effect fuel economy that much? In the past two weeks, my lifetime average (reset at 40K miles, I currently have 51K) has gone from 44.7 to 45.2. I was pretty happy with my average of 44.5mpg, but if I can squeeze the extra 4-5mpg just by keeping the A/C blowing a little more gently, I can deal with the car being a little bit warmer for a little bit longer.
Has anyone else found similar comparison figures?