I saw a video that showed wear on engine parts, and other issues of gasoline, E10, pure Ethanol and methanol, and the E10 was fine for wear.
It did mention that it caused a bit of water in the oil, but I believe it said if it sat for a long time and not so much if car runs daily/regularly.
What reports have you seen that suggests that E10 is not good for gdi engines ? Please share, if you can find these reports.
If true for sure, I'd like to know so I don't use it and watch out for this at stations.
I usually use Shell or the Ultramar that has Premium at 89 prices on thursdays.