In Texas, I believe E10 is mandated for regular, but some boat owners indicate the mid grade may be less because it works better in their boats. Ethanol is really hard on the marine motors. It's also hard on Lawn mowers.It would have to be good on at least E10 since you cannot get anything with less ethanol anywhere around here from a regular gas station. I think there are also a handful of states that make it mandatory to use E10 instead of regular unleaded.
I would be shocked if the Elio could run E85.
But I suspect the question and answer is pointed towards E85 and up.