I just realized that what I have in my tank today and since last October is .... E10 because the last place I refueld was Montauk, NY.
I called the Montauk marina to confirm and yes it was/is E10. I actually used E10 for two days last year without knowing it was E10 and did not notice the difference. Anyway, I called my dealer/marina and talked to the owner. He is not too concerned with E10 when it comes to fairly recent Triumph. Apparently changing the fuel filter often and keeping the tank as empty as possible if not boating for a long time should be the only things to do. I am picking my up on the 27th of May and plan to run it that day. I will let you know.