Not yet, but I will by the end of this summer. My body hasn't adapted to running on fats yet, because I haven't been eating low carb consistently enough. After a week or so I feel drained, and end up carbing up and starting all over. I know it gets better, I just haven't gotten past it because I enjoy my daily rides and I hate feeling like I'm dragging. I'm sure if I kept it up for 2 or 3 weeks, I'd get past it though.
I have read this article by
Peter Attia and it leaves me hope, despite what others have said.