Most Chicago area gas stations carry E10 fuel, which is 10 percent ethanol and 90 percent gasoline; but a new ordinance facing City Council would require gas stations to offer an E15 fuel blend. This blend is 15 percent ethanol and 85 percent gasoline. Is E15 a cheaper and safer option for consumers, and if the fuel isn't in high demand, why should gas stations be required to sell it? Joining Chicago Tonight to answer these questions and various hot-spots around the world is retired United States Army Gen.Wesley Clark.

Read an opposing view on the proposed E15 ordinance

​View a timeline of Gen. Clark's career.