My junk seems to run smoother on No E but probably no significant difference in power.

Years ago I had a snowblower and a chainsaw that had the fuel lines destroyed by E10. I have not had any issues since I switched them to No E. I would hope that the small engine industry addressed this issue but I think the owners manuals on all of my outdoor power stuff says No E and they sell it in quart cans for ridiculous prices. Luckily i can get No E pump gas about a mile away.