Oh no... Now you have opened the door for pressure sensor accuracy! Are you really at 92 feet?2-3% of 0.21 or whatever the mix is, makes more sense. That would put a mix of 36% O2 in a range of approximately 37.08% - 34.9%. Still means the MOD (using 1.4 ATA) would range from 99' to 92'. Not a small range, but reaching 1.4 ATA does not result in instant oxtox. Still, it's good to be reminded that limits in MOD and NDL are not to be trifled with by recreational Nx divers such as myself.