We've had 10% ethanol mandated year around for about a decade now in Minnesota statewide. Ethanol can be a problem with older equipment that was not designed to handle it, particularly small engines. At least our legislators were smart enough to allow for the sale of non-oxygenated premium fuel. While not available at every retailer, at least it is availible!
I used to keep track of my fuel mileage based on whether it had ethanol in it, didn't have ethanol in it, or unkown. I stopped when I was showing a huge gap in fuel mileage between them and it dawned on me that every time I bought non-ethanol gas, I as doing nearly all freeway mileage that resulted in ++ fuel mileage. Not exactly a fair comparison. I'm too cheap to buy non-oxy premium around here.