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I calculate mine based on miles and gallons. During 2012 & 2013 I averaged 14.2 & 14.2. This year my best tank was 16.9 and my worst was 9.8. That's 10-11 towing and 14-16 not. So much depends on the % of highway miles. Another major factor is speed. The difference between 60 & 65 is about 1/2 mpg so it adds up. At 60 the rims are about 1600 - 1700 and seems to be the sweet spot. The actual usually only differ by a tenth or so from the truck computer.
The amazing thing to me is when comparing to my previous 2001 f350 with the 7.3 and 410 rear end. Towing was virtually the same and non towing is better with the newer ford.
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