Well, this won’t answer the question re Nitrox reducing post-dive fatigue,I think it is kind of interesting... I can say that I never experienced post-dive fatigue and I also never used Nitrox. (Did not get the cert). I drove 3.5 hours to the dive site, and went on the first a.m. boat (left at 7:30) so I had to get up at 3:30 in the morning. We would dive 2 dives and be back at the dock around 12:30. We would follow the dive with some drinking and not get home until 6 or 7pm and I still did not get tired. So, I wonder why it makes some tired and others, not? Also, I actually did go past my limits and did a deco dive and it was also the same dive where I experienced narcosis. So, I learned I was susceptible to that...even though, there were other dives when I went past the 60ft (way past) on air and did not experience narcosis. Even after getting narced I STILL wasn’t tired after the dive. Lol