I have lived with ethanol from it's first introduction. Contrary to what many believe, it is not as harmful as many make it out to be. Methanol....that's a whole different story. That being said, I believe it should be mandatory to have at least 1 dedicated pump/tank for non-blended fuel. Mileage is better with non-blended, however the cost differential makes it not competitive in autos. When it was a dime difference, mileage increase made it worth it. Now it is 30-40cents higher per gallon than ethanol blends. 15% doesn't seem to have a penalty over 10%. We raced with E-85 and had success with our set-ups. Upon further study, we have heard/found information, that talks about 47% being the cut-off point for max mix for performance gains without getting into the negatives of E85 or straight alcohol. What I mean by this, is fuel delivery system is able to keep up, up to this point. After that, everything has to be upsized,etc. Our test mule for this is going to be an old school 460 Ford in a 66 Fairlane.....this summer. Nothing real insane, but fun, none the less. I have been burning Ethanol blends since introduced as I always had muscle cars that needed help via the octane bump. To each his own, but I like the availability of more fuels, especially when it cuts the amount "needed" to be imported....helps to keep old muscle cars cruising, etc. Just my $.015 worth.