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[prepares to be exposed as an idiot]
My logic says the more oxygen you can flow in and out the more your body can use it up.
You suck up some air, all the oxygen gets sent around your body, you puff the air out again without as much oxygen in it ready for delicious new oxygeny air. The greater the flow the quicker you can inhale and exhale the oxygen.
No?
Hefty
hippy
It all seems moot since gas flow isn't restrictive on aerobic performance anyway, it's not like an engine where a judicious application of the porting tool will gain you a bunch of extra horses.