With winter here I wanted this info handy. Helps me mix it strong enough so it wont freeze. I usually look at the forcast for the area I'm going and mix it accordingly.

Found this info on the Googles so who knows how accurate it is, but its a good guideline.

% of Meth __________ Freeze point in F
0____________________32
10___________________20
20____________________0
30____________________-15
40____________________-40
50____________________-65
60____________________-95
70____________________-215
80____________________-225
90____________________-230

Awesome! Thanks for posting that! Nice quick reference guide