mixture and water absorbtion

[luke2152]

So pure methanol loves to absorb water. How much does it need to be watered down before it stops absorbing water from the air or at least stops doing it rapidly. I know there's a few other variables like the temp and humidity.

But if I ran say a 75% methanol 25% water mix and left vented to atmo as it would be in the car for a month or two, will the mixture change significantly. What about 50/50 mix.