As far as i can understand boiling point is what would mather !why? Because it is the only way ethanol can vary with pressure.dam its so subtle ,i wouldnt have found.if i am right it is like this:ethanol is in vapor form get pressurised a bit by the gas pump (ideally in the fuel tank !(why?so boiling point is high enough,at atmospheric pressure the boiling point is 170 f how much is it if the ethanol gas is pressurised .if the flash point of ethanol is 54f ?then something bad is going on!any chemist in here?say ethanol vaporise at 54f!in the gas tank what is preventing the ethanol gas from doing flatuence an escape the gas .nothing.but when it escape isnt ethanol like water magnet?is it still like that in gas form.i had less question about this before this thread !but i am positive ,there is 0 % benefit to have ethanol in gas ,this would would need to be pressurised from starter to finish (a la natural gas)hopefully i m wrong ,but this feel like a sham designed to reduce car and truck durability via indirect water retention