I have a question for you guys , especially us northeastern guys. The antifreeze people say the best mixture for antifreeze to water is 50-50. My 2000 ZZ4 manual says the coolant capacity is 12 qts so 50-50 would be 6 qts. water and 6qts. antifreeze . Accordind to the antifreeze bottle that mixture gives me protection from freezeing down to -34 degrees which is about what my cooling system checks right now . My question is , is that what most of you guys run year round , 50-50 mixture ? I know here in central N.Y. , we need protection to at least -25 degrees in the winter .