Friend and I took his 2016 f150 5.0 4x4 to the deer lease last week and pulled a 18ft car hauler with a older kawasaki mule (1,000lbs maybe) on it. On the way back it was windy and I just happened to look over and saw on the cluster we were averaging 8.2 mpg going 75mph. We drove 4.5 hours and never averaged above 8.7 mpg's. He says he usually gets 20-21mpg empty. Im not a ford guy and have towed very little with any 1/2 tons since I have always had duallys but 8 mpg is hard to swallow. Is that normal for 1/2 tons to drop that much in mileage with that little weight behind them?