Look at the mixing chart that's on the back of every antifreeze jug out there- - - - -a 50/50 mix is good for -37 degrees! I believe a 70/30 mix takes the freeze point down to something like -69, colder than it gets in Fairbanks Alaska in the middle of winter.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!