So I got my nitrox certification before my dive trip because I was planning on doing 4 dives in one day and I thought it would help extend those last couple of dives. Conditions weren't great so the first 2 dives were canceled. So now were down to 2 dives, the first one was a wreck dive 70ft to the sand, and the second was a reef dive max depth of 50ft. Being a new diver still working on my air consumption, I knew for a fact I would run out of air before getting close to NDLs even on air for these dives. But I asked the guy at the shop what he suggested and he said he always suggests Nitrox. So my first question is, for these particular dives, would I have been better off diving air and saving a couple of bucks (we did 1hr surface interval because there were people in our group on air).
Secondly, I was analyzing my tanks with the analyzer at the shop and the first tank I analyzed came up at 33.5%. I asked the DM if I should consider it 33 or 34 (just for confirmation since this was my first time using nitrox) and she said "It doesn't matter either way, you can even put 32 if you want." I knew it didn't matter much for our dive plan if it was 32 or 34 since we weren't going to be anywhere near our MOD, but is that okay for her to say that or am I being paranoid about it? (I wrote 34% on the tank and put 34 in my computer for the dives).
Secondly, I was analyzing my tanks with the analyzer at the shop and the first tank I analyzed came up at 33.5%. I asked the DM if I should consider it 33 or 34 (just for confirmation since this was my first time using nitrox) and she said "It doesn't matter either way, you can even put 32 if you want." I knew it didn't matter much for our dive plan if it was 32 or 34 since we weren't going to be anywhere near our MOD, but is that okay for her to say that or am I being paranoid about it? (I wrote 34% on the tank and put 34 in my computer for the dives).