Ethanol Free vs Ethanol Gas: Does it affect performance

[j.fro]

Grassroots Motorsports ran a test of different fuels back in 2012:
https://grassrootsmotorsports.com/articles/fuel-truth/
They found a tiny hp/tq advantage w/E10 over non-ethanol 93 octane. Go figure. E85 made a big boost in power, but you had to be able to tune for it, and mpgs were really low.
Ive used the Road Trip app to track all of my cars since 2010. I don't have any power figures, but non-ethanol 93 regularly returns the best mpg by 2- 3 mpgs. E10 wrecked havoc on the fuel lines in my chainsaw and weed whacker.