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elllguapo
At what intensity?
I'd need to find a doc for the proper science but muscle glycogen and liver glycogen and I think blood glucose are all used in preference (and in greater amounts) to fat unless you're empty (say doing an unfed early morning workout after low-carb dinner). Doing this intentionally can have some benefits when it comes to improving your body's fat utilising shizzle but it's at the expense of your carb using shizzle so everything above plodding ultra pace is worse off.
Carb rinse does improve performance (mouth receptors detect carbs) but it's useful for things like football matches which last only ~90min, taking on fluids can cause gastric issues and they're already fueled for the match.
Best bet is doing a mix of sessions. Some easier ones fasted and the bulk should be properly fueled harder sessions.
Personally I prefer to do a 3hr ride faster with some energy drink (inc. electrolytes). My calorie deficit is higher even with the calories from the drink and I'm actually getting some training benefit, plus I'm less inclined to binge afterwards and I've done less damage to my muscles so I can do repeat bouts day after day.