Changing pumps to sell a fuel blend of 15 percent ethanol — what you buy now has 10 percent — would be a big expense for gas stations. And E15 isn’t safe for use in many older engines, from cars to trucks to boats to lawn mowers.

 

http://www.chicagotribune.com/news/opinion/ct-ethanol-e15-chicago-edit-1208-20141205-story.html