Corn-based ethanol is a huge boondoggle. It is hard to transport, needs lots of petrochemicals to make and is a net environmental loss. Unfortunately, all of Washington is terrified of offending mid-west corn farmers who are accustomed to huge subsidies. There was a recent announcement that ethanol polluting your gasoline is going from 10% up to 15%. A gallon of ethanol contains substantially less energy than a gallon of gasoline. Expect slightly decreased mileage, possible increased hot weather vapor lock problems, more “check engine” lights, and absolutely NO benefit except for some a misguided perception that ethanol in your tank serves a “save the planet” purpose.