I drove down to Southern NH (Nashua) Saturday afternoon and was surprised to see the amount of snow accumulating. 40 miles North we only had a dusting. I put it in 4Auto and had no issues. Stock tires too.
I'm assuming you fueled up somewhere in NH or Mass. Could it be the fuel we have is a different blend and that affected your MPG? The past few weeks with light 4Auto or 4Lock usage I've been averaging around 25mpg. I keep it at 65 though. Haven't towed yet with the colder weather either.