Oh yes, this part is well known. I'm not trying to get 20 mpg while towing. That is an impossibility. 20 mpg when I'm NOT towing is the goal so the rig can double as a family truckster. That is good news about towing at 60-65 and not feeling like it was being pushed with the 5.4 (an engine that doesn't have the best reputation). That really is my main goal. I tend to take it pretty easy on my vehicles and don't want to abuse them.