I took delivery of a 7.3 Superduty last week and have not had the opportunity to tow with it yet but I have made a 300 mile day trip non towing in Eastern Kentucky. I was very impressed with the MPG driving at 55-60. At one point the computer said 18.4 but overall on my return home it read 17.2! Some of this trip was country roads that were hilly and some of it was in stop and go traffic but overall I would say the majority of the trip was on flat terrain. I'm very impressed with this engine. I think it will be a towing beast and should certainly cause those who pay the extra $9000 for a diesel something to consider. This new 7.3 push rod engine is going to be a game changer. My previous truck was a Ram 5.9 so I'm accustomed to the torque of a diesel. My 5th wheel weighs about 10K loaded for a trip. From what I have read towing over 14k would probably give you a reason to consider a modern DEF diesel. The diesel world changed in 2012 models and not for the better!!