You can win free fuel by reporting fuel prices of E85 and other ethanol blends on e85prices.com.
All you have to do is download the app, create an account, and start reporting the prices of the ethanol blended fuel in your area or wherever you find yourself during your scheduled summer driving. Each time you report a price (you can report multiple prices per day) you are entered to win $50 in free fuel!
Winners are drawn every single day from Memorial Day through Labor Day and announced every two weeks.
For full contest details, click here.