How much of my fat stores am I realistically using on a zone 1-2 ride?

Nutrition
21

I would glibly reply “that’s what all endurance training is about”, but it’s actually not. For the most part, training reduces CHO utilization, which simply allows our muscles to continue to rely on fat as exercise intensity increases.

As for “Fatmax”, it is really just another measure of “threshold”.

22

I think you were looking for this in the first place:
“ Regulation of endogenous fat and carbohydrate metabolism in relation to exercise intensity and duration”
https://journals.physiology.org/doi/abs/10.1152/ajpendo.1993.265.3.E380

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23

If only those data were completely reliable.