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Octane has nothing to do with energy content. You can find gobs of info on octane, what it is and what it does, using google.
Ethanol has less energy per gallon than gasoline. IMO, you will probably get better fuel mileage on the straight gas than the 10% ethanol.
FWIW, I've had my V6 truck for over 10 years, and have gotten over 20 mpg on only four tanks. Two of those were filling up with Nevada gas. I usually get around 15 mpg, mostly city driving, on bad California fuel (10% ethanol). I rarely get 17 mpg since we went to 10% ethanol year round.
Also, the 255/75/16 tires are taller than the 255/70/16 that many of us got as original equipment. The taller tires may make you run at a lower, less effieicent rpm. I know when I went to 265/70 from 255/70, I lost performance and mpg.
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