As a point of interest, I bought a '13 Ford Escape new from the dealer, and the low fuel light would come on very early. There was a Tech Bulletin that Ford put out to adjust it and change the display options, so the low fuel light and chime came on much later. IIRC it has a 15 gallon tank, and if I wait till the light comes on it will take a touch over 12 gallons. Before the adjustment, it rarely took over 10 gallons with the light on, which was pretty annoying.
Don't know if that would have applied to the SuperDuty trucks as well. But worth asking a dealer about it.