Ok, I'll take a stab at it.
Denatured alcohol is easier to get but more expensive. Its believed to be in the 108 to 110 octain (maybe someone can confirm this).
Methanol is cheaper, harder to get. Believed to be closer to 118 octain (Again, maybe someone will confirm this).
both will have a good cooling effect but remember for EGT cooling you certaintly want some water. As you start adding higher concentrations of methanol your EGTs will rise VS higher concentrations of water. Atleast thats the data we have on alot of the big diesels we sell to, I would assume similar with a gasoline engine.
CM
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