As a daily in town drive I avg 13.7 mpg and on the Highway about 18.5mpg but I have the family with me when on the highway. Just got finish with a trip to Corpus Christi and I managed about 9.5 mpg coming back and on the way there I only got 8.5. Not to sure of the difference other than the tail wind coming back. My travel trailer is 33.3Ft long and weights about 8500 loaded. I keep it dry till I arrive on site so its about 7800 when towing I think. about 1000lbs of passengers....yaa were a bit heavy too. I was very impressed with the 5.4L easily pulling the load and not once did it over heat and I maintained 65mph the entire trip. I always set the cruise so I can concentrate on the road more. It will get up to 75 and 80 effortlessly but that's just not safe with a trailer. Hope this helps someone who might be wondering about the 5.4L. I have been thinking of a 2014 Platinum Long wheel base 4x4 with the 3.5l Twin turbo since I don't pull often and it would definitely be a better daily drive and supposedly pull with more power but im still satisfied with the 5.4 knowing it has to strength and was actually used for the F250's just a couple years ago.