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your rambling encourages NOT reading......
But from the first few paragraphs I can say this:
you seem to be weighting everything equally. not so.
Taller tires barely weigh more than the stock tire.
The issue w/ 'extra wieght' is when a taller wheel/rim is added (14" to 16") then you are moving the extra weight farther out.
But the solution is much simpler than a long rambling post.
Using a scangauge, take an mpg reading at 50, 55, 60, 65, 70, for aprox 5-8 miles on a flat freeway at a cruise controlled setting.
also record the rpms.
Now you have a baseline to measure everything by.
A 5% taller tire will spIN 5% LOWER mph AT A GIVEN rpm.
Trucks are normally geared for mpg on the stock tire. so going TOO tall can be counter productive.
But by having the baseline chart, you already know where the sweet spot is on the rpm side.
And smaller diameter(than stock) tires should be edited out of your rambling. YOu are wasting reading time on a complete non-issue.
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