I’m not sure what your opinion is, if any, of INSCYD testing, but I went through one of their metabolic tests ~4 years ago and part of the output was the chart below.
Not sure if it’s accurate, or representative, but it was actionable in that it set my FatMax range. I believe there is some controversy or misunderstanding(s) on this board as to what that term means … but the coach I worked with at the time used the middle of my FatMax range (I believe it was 185W) as the number I should be around when I went on long (4-6 hour) endurance rides to maximize benefit while minimizing recovery needs.
Thoughts?
EDIT:
I also received this table. Again, unsure of its utility other than how to apply FatMax to training. I suppose it could directionally help you understand/visualize how much you should be fueling during a race at an anticipated intensity.

