While not a proponent of the ethanol industry, I use it. The only station around here that sells straight gas is 30 miles away.
As noted by klr4evr, shelf life is a concern.
Which brings up a related question, since I run the ethanol blend in everything and we're talking shelf life.
Seems like all small engine manufacturers recommend you drain the fuel system for storage. I'm guessing they're probably right and I'm probably wrong, but I don't do it with my motorcycles, mowers or anything else.
At the end of the season, I fill the tanks, then add fairly copious amounts of Seafoam and let the engines run for awhile to make sure the Seafoam has circulated through the system.
Everything fires right up in the Spring. Again, I may be foolish, but it seems to me there are components in the fuel system, such as seals, o-rings, etc., that depend on the fuel for lubrication/preservation. It doesn't make any sense to dry them out for months at a time by draining everything.
Am I mistaken? Should I top off the KLR tank and add some Seafoam, shut off the tank and then drain the rest of the fuel system? We're talking a term of about 3-4 months here with a 10% ethanol blend and Seafoam in the system.