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If you have no cooling issues with a 50/50 mix of water and antifreeze then stay with it. In hotter places like here in Texas it is customary to go with more water than anti-freeze to help cool better.
Water transfers heat better than anti-freeze so even though water has a lower boiling point it does a better job as a coolant. Water Wetter helps water transfer heat better as it reduces the amount of surface tension water has which gives water more surface area to contact the radiator. Soap does the same thing but you wouldn't want to add that to your cooling system. Water Wetter also provides some rust and corrosion protection which is why you can run it with no anti-freeze.
Right now I have no anti-freeze, just water + water wetter. In the winter I add in a little anti-freeze if I think there is a chance the water will freeze.
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