We've all read the articles on 'hypermilers,' people who use extreme methods to increase gas mileage; such as coasting with your engine off, drafting behind big rigs, and driving much slower than the speed limit.
Idaho State Police and driving experts now say what they're doing is not only dangerous, but could be illegal too.
Here's the story. Have you ever tried any of these techniques to save gas? If so, did it work?