Question: what is the difference between regular gasoline and flex fuel?
Answer: E85, or flex fuel, is a blend of 85% ethanol and 15% gasoline that can be used in vehicles specially designed to run on it – as well as regular gasoline. ... The average price of a gallon of gas is about $3.54, according to AAA. So if your car can run on flex fuel as well as gasoline, the choice seems clear … but it's not.