Car Manufacturers are voiding their warranty for pre 2012 vehicles for using E-15 or higher Ethanol.
http://video.foxbusiness.com/v/2000862202001/
I suspect this has already been occuring to the present Ethanol gasoline in our small gasoline engines.
the link didn't lead me anywhere useful. But I don't like like the whole ethanol fuel thing. I don't believe the way we get a large amount of our ethanol, from corn, a human food, makes sense. But then the corn is mostly GMO so I don't really want to eat it either, so maybe that's a good use for it. ???
info E15
http://www.humanevents.com/2012/09/18/with-e15-the-ethanol-industry-wins-but-american-consumers-lose/