The latest research indicates that a 2:1 ratio of Maltodextrin to Fructose provides the most sustained energy during extended periods of exercise as each carbohydrate source is processed through a different pathway in your gut. Because of this, your body can process more calories per hour without GI distress from this combination of carbohydrates than from a stand alone carbohydrate source. No other carbohydrate source or combination of sources provides longer lasting fuel for your endeavors