I my area, the premium gasoline contains no ethanol.
I e-mail"d three of the oil companies with retail stations in my immediate area and they all replied, confirming that their premium is ethanol-free.
I have switched all of my engines except the daily drivers to premium for this reason.
I think there is truth to the statements about problems with ethanol. The manuals that came with two new small-engine powered products I bought recently state that fuels with higher than E10 should NOT be used, and they state that the shelf-life of ethanol-based fuels is very short !