Thanks for that explanation.
This is what Ilove about this community, so much t learn 
This appears mostly based on duration (sorry, haven’t read all the links yet), but is there more explicit advice based on correlation to zone intensity? Asking because I’d like to race in a higher zone for as long as I can, but that inversely limits my calorie intake as my GI system just shuts down after a while.
Duration and intensity will drive the demand for carbs, but the higher the intensity, especially above LT2 will most certainly be mostly carbs. At lower intensities, you’re still using carbs, but at a lower rate, so as duration increases, you will require more carbs. It all depends on how efficient you are (aerobically) and where the crossover point is; the 50/50 carbs and fat. That is why the common recommendation would be as much as you can tolerate.
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Wau! That was pretty interesting stuff! Thanks for sharing 
