I just drove a 2018 Expedition with the 2.7 as a rental for 1500 miles...Decent performance in the northern Rockies. Mileage was just pretty much as expected for what the vehicle is... averaged something like 18.5 mpg in mixed interstate and rural highway driving. Got the same in a Nissan Armada with their V8 in the same territory a year before. The one thing I noticed....it had a 10 speed auto trannie. Goodness!