You seem to be fixated on replenishing carbohydrate fuel during an endurance event. You might want to reconsider your nutrition and training regimens so you can avoid worrying about carbs. I've learned that long endurance bike rides are so much easier to COMPLETE when I'm fat adapted and don't need to worry about replenishing carbs. See
. Furthermore, a lifestyle that includes massive consumption of sugars to keep one going on a bike usually leads to insulin resistance and fatty liver problems. Not good.