Oops. Yep, I added percentages in my head instead of actually calculating the amount of gasoline in the 22.73 gal of E85 which would have been 3.4 gal of gasoline in 22.73 gal of E85. I'm going to edit that mistake and correct the original. Thanks for catching that.E85 is 85% ethanol, so you would be using more fuel (ethanol), not necessarily more gasoline. (semantics)
Still, the rest of your analysis looks spot on to me. Looking forward to getting a Mr. Fusion installed on my old pickup.