[mkmskm]

For me you're asking the wrong question. My car is stored in an unheated garage so I will NEVER put plain water in it as I don't want to get caught by a freeze or hassle with changing the coolant that often. I know several guys who have ruined engines with water in them because they forgot and it froze. I've always run 50:50 in all my old vehicles and it works great plus I don't ever have to worry about them. Remember when the Model A came out they use alcohol based "Antifreezes" that you removed in the summer and when ethylene glycol came out in the 30s it was advertised as "permanent antifreeze".