With our intermittent Search function running, I couldn't find a consensus at all except from some guys talking about Engine Ice, which I understand is Propylene Glycol and water 50% premixed alread for crazy jack. So from googling around and such, it would seem the cheapest and best recipe for a coolant mix is Distilled water ~75-80% Ethylene Glycol based coolant ~ 20-25% The ~ for Water Wetter to add to the mix. Straight water doesn't sound like an option on our engines as magnesium, aluminum and iron are creating a corrosive enviroment with each other and the water pump seals need some type of lubrication. Though, pure water seems to have the best heat transfer capabilities. Straight coolant doesn't transfer water very well from what I've read. The manual says 50%, but that seems a bit heavy after boiling my bike over every ride and race last summer. I'm looking for the best most effective mix so that I dont' have to throw 400 bones at new radiators, which I don't have. The 80/20 mix, raises the boil-over point, retains a majority of water's heat transfer ability along with the Water Wetter and maintains an antifreeze of less than below freezing and also provides lubrication. Any other opinions?