Running straight coolant will actually lower your car's overheating / freezing prevention ability, the water is an absolutely essential part of the mix, with pure antifreeze it's almost as bad as running straight water believe it or not.
It may seem like straight coolant would be the best thing, but oddly enough it isn't.
And yes, I called Prestone years ago about this because it didn't make sense to me either, but that's how it is, water is needed to get the protection.
Originally Posted by theclencher
Just run what they recommend and be done with it.
I always mix it 50-50, that way it's easy.
A FE gauge should be standard equipment in every vehicle.
I have a car that I only use in the summer. Therefore on this car, freeze protection is not necessary.
This engine creates a lot of heat, therefore I need maximum overheat protection.
In this car I run zero antifreeze. In order to run without antifreeze, I add about 8 oz of RMI-25 which provides corrosion protection, lubrication to the water pump, etc., which is normally done by the antifreeze.
Pure water has higher thermal conductivity than then antifreeze mix. However, if you run your engine hot (~195) then there is the possibility that you'll get steam pockets which will really reduce thermal conductivity. Since I run this engine colder (~160 - 170), it is cold enough to run the pure water.
But remember that for optimum gas mileage, generally you want the engine to run hot for best efficiency.
Use the proper coolant in the proper ratio with distilled water. It comes pre-mixed. This will protect your cooling system, head gasket, etc. which are not a cheap hobby to fix, repairs of which will eat up whatever fuel you may be saving, for the next decade or two.
Water Wetter is an additive that improves heat transfer of coolant. Add to coolant and your fan will have to work less, saving a bit on fuel.