I missed this one. We all heard when Trump ruled that e15 could be sold. What we missed, probably because it was only publicized in Iowa (tight election!), is that e15 can be put in an e10 pump without labeling it as such, subject only to state approval.
I'm not sure it's much of a news item. It may very well be reversed, and probably will never move far out of the heartland.
But the thing to remember is that marine engines, including outboards, do NOT have computers and CANNOT adjust to the leaner conditions this creates.
Be careful what gas you buy. E10 is sort of OK. e15 is probably OK in your car. But not in your outboard.
Interestingly, this was announced mostly in Iowa 52 days before the election. Kinna obvious. If I lived in Iowa I'd ask "Why not three years ago? And will you change it back in a few months to court big oil... again?"
Actually, it seems there is no such executive order. He just tweated that there would be. So he lied to Iowa?
If I'm wrong, post the link. I'd really like to see the text.