Wiki has an Energy content table halfway down the page at
wiki/Ethanol Methanol has 17.9 MJ/L compared to 21.2 MJ/L for Ethanol.
21.2/17.9=1.18 ==> Ethanol has 18% more energy than does Methanol.
The difference between your .333 increase and the .18 theoretical (by volume) is interesting. You're getting better than theoretical improvement using less than optimum (pure Ethanol) fuel. Sunnyside should do even better.