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Please explain why you save gas hanging out of the surface with a snorkel.
I find floating the on surface waiting for someone to get their act together, I can breath the ambient air just fine and am more aware of surface dangers (boats, other divers jumping in, etc...) since I can both see and hear what's going on around me. I only use it for longer surface swims when I need to accurately navigate and/or be more aware of whats under me than on the surface. Handy tool, yes, but not critical.
I think the obvious reason is that there may be big surface chop or worse and there is somewhat less chance of getting a mouthful of water. If I have plenty of gas to spare I will keep the reg in instead--no chance of that mouthful.