Just so I’m clear, I don’t recommend doing intense workouts fasted necessarily. That is, you can be properly fueled coming in - eat your breakfast a couple of hours prior, whatever your schedule dictates. I’m strictly talking about taking in the 80g of carbs during a one-hour workout or during your sprint race (assuming a finishing time of 75 min or less).
The only workouts I personally do fasted are easy sessions like Pettit, Carter, Baxter, etc. But I’ll do the 1-hour sweet spot jobbers with nothing but water. Once I get into threshold+, I like to have some Skratch in my bottle too.
Now, as a triathlete doing two-a-days, you can make a case for fueling more, just not necessarily during your workouts. In my experience, I find I have better success taking in more calories between workouts or in a more calorie-dense recovery drink than I do taking in gels/sports drink during the shorter workouts. So I might do an hour in the pool in the morning without anything, but I’ll have a bigger breakfast, or a mid-morning snack after my recovery drink to try to replenish for the afternoon run.
In any case, best of luck! Please ask more questions if you’ve got them!