Coincidentally, we almost lost our Yukon to the stuff recently.
We’ve been using the Taurus to save gas for months and the Yuke had lots of “mystery water” in the tank which froze up and caused all kinds of trouble.
It’s better, now but this explains where all that water came from.
It’s not just the ethanol, but if the tank isn’t full, there’s always condensation in the inside of the tank that forms, so that’s a second source of water right there. That’s one that can be avoided by a full tank though.
You can always put some de-icer in the tank, and also sta-bil into the tank if its going to be sitting awhile.