That's just an estimate bud. The actual relationship is not linear. I used an engineering calculator that uses the actual formula.
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It doesn't have to be that exact anyway. Antifreeze changes the boiling temperature (usually lowers it), stuff like "water wetter" can raise it, and there's always the fact that you can get localized boiling at say, the jackets in the heads because the temperature is not perfectly homogenous throughout the whole system.
The point was simply that 212 isn’t a problem because we’re not boiling water on a stove, it’s under pressure.
