I know exactly what you mean by “overanalysing” and a day after writing the question I did not really expected an answer since I understood that I’m going too deep into small details.
Regarding 20g, I am at the moment eating less than that and my endurance performance did not drop when I was consuming carbs, I can actually go for longer and food cravings disappeared. The reason why I was asking this question was essentially “How to get the benefits of keto (i.e. maximum fat adaptation) without doing a ketogenic diet”. As it was mentioned in a couple of posts here, the diet is too strict for most people to adhere too and even the biggest diet advocates that are into endurance sports seem to drop the diet after a while, despite it producing excellent results. I guess not being able to eat a cookie that your daughter made requires a person to re-evaluate his priorities in life.
However, I would not say that a ketogenic diet is “squeezing the last few percent”, in my head at least it can be a game changer in performance since people claim that they become “bonk-proof”, which is what TFNA is striving for, right?
Anyway, I am just exploring eating strategies that would enable me to be bonk-proof and be able to go for long durations without any food.