My bike sat for 6 months over Winter with non ethanol 94octane gas in the tank, and no stebel, and then started on the first push, like it had been ridden every day.
Would it do that with low octane ethanol gas? maybe, but I'm not going to try it.
I find gas mileage goes up with higher quality gas, and I feel better performance as well, so i'm going to stick with it, and only put regular with ethanol in if there is no other convenient option.
Now the difference between regular with ethanol, and high tier gas with ethanol, I doubt that makes as much of a difference, but perhaps a minuscule amount, still, which side of the scale do you feel more comfortable with? The extra costs are not noticeable in the big picture.