The Environmental Protection Agency is going to require all consumers to buy at least four gallons of gasoline from certain gas pumps after the new E15 ethanol-gasoline blend is introduced into the market. The new regulation was revealed in an Aug. 1 letter to the American Motorcyclist Association, which expressed concern that the vast majority of motorcycles and ATVs in use today aren’t designed to operate on E15 fuel and residual fuel from a pump that serves multiple blends might harm these tanks. “The use of E15 will lower fuel efficiency and possibly cause premature engine failure,”