dkktsunami
Contributor
Assuming that you were using an aluminum 80 (77.4 cu. ft.) for a new diver your gas consumption was not bad.
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Diving at altitude primarily affects nitrogen offloading when you return to the surface (thus the need for more conservative diving). It should not affect your gas consumption.Also, I forgot to mention that I am at altitude. I think that might affect it. I dove to 50 ft at an altitude of 6000+ ft. So I guess that equates to 70 ft.