Is Keto beneficial for endurance athletes?

Endurance exercise athletes' physiology was believed to be fed primarily glucose. In other words, when an athlete depleted their stored sugar, and glycogen they will become fatigued and hit a wall (bonked). This has led many athletes to consume carbs before, during, and after. However, new research has demonstrated using fat as a primary fuel source and using ketosis as a way to do it. This must involve becoming keto-adapted. This is what has been missing - getting an athlete to adapt fully to ketosis. It was then found that elite endurance athletes burned more than 2x the fat than carb-fed athletes.