I just had the recall re-calibration done on mine and I'm not sure if I'm just seeing what I want to see or if it's truth but I feel like I'm getting way better gas mileage when towing compared to previous trips in the spring. I remember camping out at a spot about a 1.5hrs away through some good hills and using almost a half a tank. This trip I used barely over a 1/4 tank. I also think I've gotten a lot more conservative on my driving habits when towing so that also helps. It's amazing how as others have posted that going even 5mph slower equals huge mpg savings.