Got it.
I use Beta Fuel for long rides with pretty much the same effect. I don’t gain much performance during the ride, but the recovery is drastically improved. It’s the difference between being dead on the couch vs. cleaning the yard for 90 minutes late in the afternoon.
To answer your original question(s), for TR workouts, I fuel about 30-50% of the total calories expended, mostly in carb drink. Closer to 30% on a 60 min workout and closer to 50% on a 120min.
Regardless of the intensity of the ride, there will be some fat burning, so there’s no need to replace 100% of the calories expended in carbs. Likewise, there’s no need or benefit to being 100% topped off in glycogen at the END of the ride.