Your notes are more correct than your wrist watch. I've recorded the tracks before with an accurate GPS. I can't seem to find the file right now, but I believe the mileage was just a tad over 5 miles even one-way. We didn't veer off course though. Even though you guys went off a little, there's no way it added up to 4 miles.
Thanks. It certainly felt longer that 5 miles each way!