Long story short, late night, long day of driving, was about out of gas, stopped at the nearest station which was a Jump-Start. Saw they had 93 octane fuel (a rarity in this area) so I happily selected that grade and started filling up.
As my eyes adjusted to the lighting in the area, I noticed a VERY tiny little decal under the 93 octane selection which said, "NOTE! 30% ethanol fuel - only to be used in Flex-Fuel vehicles". By this time I had about 6 gallons in so I stopped it, and then went down the highway to another station that had 91 octane with only 10% ethanol. Filled the car up and drove it for the next few days...no drama, but damn! I was pretty concerned at first, but figured I'd diluted the alcohol content down somewhat to be relatively safe.
Kind of pissed me off that there is just this tiny little decal describing the fuel content, and it is basically tucked UNDER a little protrusion on the pump...very hard to see.

 

I don't think you have anything to worry about with a one time over exposure of ethanol,