Hey guys quick question, I filled the boat up with 91 octane about a month ago hoping I would use it a lot more before they shut the boat ramps down here in Colorado and the local lake shut down super early and I wasn’t able to get out there unfortunately.

My question is it’s filled 9/10ths of the way with 91 octane the pump says (can contain up to 10% ethenol) so I this gasoline considered E-10? I heard that’s super bad to let sit over winter with E-10 and additives won’t help it from attracting water and separating. What should I do? I own a fake a lake as well so I can run it out of the water Incase I need to run it with additives.

Not sure it is matters but the boat is a 2005 moomba mobius Lsv. Boat sits in a heated shop too btw.