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- I'm a Fish!
I haven't done a full statistical analysis. But, from my anecdotal reviews of my log (where every dive is logged with AI), it seems that the difference in my RMV between diving in a wetsuit and a single tank, compared to drysuit and doubles, is about 0.2 cu-ft/min. I don't even want to think about what my RMV would be if I were diving dry, doubles, carrying multiple deco/stage bottles, and actually having to swim!
in the caves it's not usually sac rate that changes much, it's the swim speed reduction from the drag that usually kills you