ethanol and methanol
The difference in power from methanol and ethanol is mostly theoretical.
In tests run durning WWII on water injection for combat aircraft there were no significant differences between ethanol and methanol mixes. There were however major differences with isopropyl as it needs significantly different injection rates than ethanol and methanol. The difference was significant enough that when air crew used isopropyl (de-icing alcohol) in the ADI systems they blew engines because the system was calibrated for ethanol and methanol.
Methaol is more corrosive than ethanol as it is electrically conductive. It increases electrolytic corrosion caused by dissimilar metals that are constantly wetted by the injection fluid. It will generally have no effect on metals that are not in continous contact with the solution with the possible exception of Zinc and magnesium and maybe unanodized aluminum.
Larry
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