[chris vickery]

Ethanol is corrosive in contact with rubber components like fuel lines, gaskets seals etc. Most modern vehs overcome this as they are manufactured using synthentics in the fuel lines which are resistant to modern fuel and fuel additives.

Personally I would not sweat it much but would avoid using fuel from the farm stores etc or ones advertsied as ethanol. The percentage of ethanol in most unleaded gasoline is less than 10%. Considering that you have mostly steel lines on mvs, the small bit of rubber is hardly woth the worry. If it bothers you, go to the auto supply store and get some neoprene fuel line and put your worries to rest...