Originally Posted by 9D280
I can assure you it will be nicely mixed as soon as you move the trailer!
Which then brings uis into the "what % water will actually
be in the mix, and more importantly can your engine put up with it for a tankful?
The added ethanol itself is like 99% ethanol. There's no water in it by design. I can in theory absorb water and that actually happens. But the fuel antifreeze you need to use in (in places like Minnesota and Canada, not here in Seattle) guess what, that's alcohol - either methanol or isopropyl. In either case its intended to disperse the water in fuel tanks and allow it to "burn" off. It doesn't actually burn of course but small amounts of condensation in a larger volume to fuel pass readily through automotive (and marine) engines.
I have never had a problem leaving E10 in my 4 stroke 60hp for months. Perhaps there's some slight extra water absorbed but it passes through without issue and is not separated (or it would be visible in the fuel water separator). Having a deck mounted fuel tank with a closable vent is a big help to avoiding fuel related problems.