Finally took a trip with our 2015 Expedition with 72,000 miles. We traveled 6000 miles from Michigan to Capitol Reef, Tetons, Moab, Bryce, Zion, Yellowstone, Mount Rushmore. I was surprised to get a 21.8 MPG average. I checked it both manually with a calculator and with the digital readout on the car. Best mileage was achieved at an even 70 MPH, anything higher lowered the mileage. Worst mileage was 16, best 26 drafting a motorhome. Used the cruise control as much as possible.