Ok, so I posted a thread when I first got the truck a month ago about how crappy the MPG was and I wanted to know if this was normal. So far its stayed around 12.7 - 13.1. Tonight I fill up and reset the meter. I decided to try to shift up to 5 since I was curious how much worse the MPG would get. Imagine my surprise when the MPG went all the way up to 17!!! How on earth is this possible? I even went back out later and drove normal with the mds on and the damn thing went back down to 13.