Bottom line: DON'T DO IT!!!
The E15 Gasoline that has been approved for "Summer Use" throughout the USA, may be coming to our area soon enough. You may also encounter the gas while traveling this summer.
E15 was designed for "flex-fuel" vehicles, cars and trucks whose engines can handle the increased ethanol in the gasoline. This is not your Harley motorcycle!!!
The heart of your Harley - i.e. your bike's engine - was never designed for more than 10% ethanol added to your gas (usually noted on gas pumps). Never pump E15 into your bike's tank.
Should you pull up to a gas station that has E15, look for the High Octane Gas -that typically has E10. Most gas stations in our area have non-ethanol high octane, however that could be a different story when traveling.
Remember, most newer bikes can handle up to 10% ethanol (E10) in the gas -which is the norm for most places. You can also use a gas additive like K100, Star Tron, STP, and Lucas Oil when you're pumping High Octane E10 gas into your bike.