A glycol/water mix is almost always chosen primarily because of the anticorrosion purposes and freezing point alteration. If you have a racing car you run pure

A glycol/water mix is almost always chosen primarily because of the anticorrosion purposes and freezing point alteration. If you have a racing car you run pure water with a bit of 'wetter' (a surfactant) in the cooling system as it gives you the highest thermal capacity / cm^3 ratio. If you want to increase the boiling point (to run a smaller heat exchanger) that's most trivially achieved through pressurisation.