Here is a link to show you where to find gas stations that offer regular gasoline without the ethanol additive that wreaks havoc on marine engines, as well as motorcycles, lawn mowers and other gosoline powered items. http://pure-gas.org/index.jsp?stateprov=WI.
The Boat US website has quite a bit of information on the dangers of continuing to use untreated gasoline containing ethanol in your boat motors. http://www.boatus.com.