Ethanol Blends Increasingly Common: Want Pure Gasoline?

The next time you fill up, think about this: What you think of as gasoline might not be gasoline. At least not entirely. Take a close look at the pump you're filling from; there will be a label with fuel details, and odds are you're probably filling up with E10, a blend of 90 percent gasoline and 10 percent ethanol—usually derived from corn...