I've had the EZ Edge a week now and I know my fuel mileage has gone in the sewer. This box is amazing at what it does to a stock truck. Used to stay on the pedal and stay in the legal speed limit, but now have to let off the pedal almost as soon as I stomp it to keep from getting a ticket or killed. I'm hungry now!!! If this is the mild end, I need to go to the medium end and I'll be satisfied. I hope I get this out of my system so I can get that better fuel mileage that the EZ is supposed to give.