This is from a Corn based Ethanol affects. The only question is my mind id a 10% or 15% blend mix? It is destructive stuff. I finally went to a 2 fiklter system with a screw can and replaceable elements and you should see what those filter elements look like after 1,000 miles. AND now there is talk a Sugar Cane based ethanol is coming next. Is it less damaging OR are the petroleum blenders just stretching out the gas and enhancing their profits more? We pay, they play!