I don't always agree. If you have an NA 4 cylinder that is stock and they tell you to run premium, theres no reason to unless it has an extreme compression ratio. It doesn't "burn cleaner," "give you better mileage," or any of the other myths. Octane rating is just as the article states; a determinant in when knocking will occur. Different brands of gasoline may contain detergents and other additives, but it has nothing to do with octane ratings.