Actually, A heli-Ox mix isnt out of the question, it'd just let you take more Helium with you.
Like AK said, I'm not a sipper either, so buddy-breathing at the bottom of a tank scares me. I've been so low on air before that my tank was less dense than the water, forcing me to hold on, upside down with a totally empty vest, to the anchor line on my deco stop.
And Yes, I too wear a dive watch, don't totally trust computers, and still manually log my hours.
Plan the Dive, Dive the Plan.
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Luck is a residue of Design.
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