Many years ago, I ran into a Ducati Sport Classic rider that though the whole "E10 ethanol damage thing" was just another internet rumor. "My bike is just fine," he told me. Of course, I (having owned a Sport Classic) knew better. I walked over to his "perfect" bike and lifted the fuel tank up off the frame with my hands. "Ethanol has caused your plastic fuel tank to expand to the point where the only thing holding it onto the bike are the fuel lines and gravity," I told him. You've never seen a bike owner get so slack-jawed in your life. I sure ruined his day...some people are just oblivious. Ignorance is bliss, I suppose.