I get the towing at 65, that's what I tow at as well but you can't simulate towing mpg's without the wieght. If you are going for real world mpg's while empty you need to do the speed limit. The only thing this test showed was that if you drive 10 mph under the posted speed limit you will achieve Ford's and the EPA's posted 23 highway mpg's. Still impressive and I imagine the truck would have only lost a mile or two mpg's at 75mph but I still would have liked to seen it.