I apologize for placing information that is inaccurate. I must have been thinking of another fuel when I placed my post.
It is correct that the marine fuel sold on the lake contains ethanol (most likely 10%) and is most likely 89 octane. The fuel does however contain additives and stabilizers that allows it to fend off phase separation for up to at least a year (in the case of ValvTect Fuel). I would love to see the marine stations get rid of the ethanol instead of treating the ethanol, but one thing at a time.
For those who would like to track down truly non-ethanol fuel you can go to the following site which lists each location where it can be found in each state:
www.pure-gas.org/