human
I've been hearing a lot about a new type of fuel that is made from corn. I'd like to learn more about it.
assistant
Corn-based ethanol has been around for quite some time, and has been used in many different types of engines. It is currently the most common type of biofuel in use today. Ethanol can be blended with gasoline at any concentration up to 10%, which is known as E10. Higher blends are also available, but they tend to reduce engine performance.