As a fellow endurance athlete who has experimented with fasting I would say don't waste your time. While I do think the response to fasting is somewhat personal, for me the impact upon long-term fitness, work/life stress (cortisol) [1] and ongoing metabolism [2] is just too severe to be ignored.

[1] https://www.precisionnutrition.com/all-about-cortisol [2] https://www.outsideonline.com/2284636/scientific-case-big-br...