Yeah unfortunally it takes variability and your estimated VO2max into account. I’ve run in this problem with EVERY commute. High VI calculates high carb utilisation. Even if I do only 40%FTP average, but maybe 50% of FTP as NP - because there are some hills around me… then it calculates 100g carbs within 15minutes commute or so.
I’ve raised this problem somewhere in this thread, but don’t know if the original data modeller / paper author is still reading it on the forum, so I doubt it ever get “fixed”:
So I can’t use this metric if I still track my commutes …