Gasohol Mileage versus Gas Mileage

Ashton Crusher wrote in news: snipped-for-privacy@4ax.com:

one tank full means nothing. too many variables to have a compairason, unless you drove the same route the same day with the same conditions. A little wind can change it that much. KB

Who are these experts? Hexane, heptane, octane and nonane have very similar energy content, within 1% Ethanol is significantly less. In gasohol, the refineries would dump more heptane in, and the alkane mix would have pretty much the same energy content, but the ethanol would drag it down. What percentage of ethanol was the stuff you put in? For E10, the MPG would only be a few percent less.