In some of the posts you mention your lower than average gas consumption. I've noticed in the videos, that during your breathing cycle you often (not always) have two "spurts" of exhalation for every full inhalation. Is this a conscious technique you use or just your natural breathing pattern? Just wondering if this technique, intentional or not, might help lower gas consumption.?
Honestly I never noticed it, so it isn't purposeful. I credit most of my lowish air consumption is on being very comfortable in the water. I tend not to be overly excitable.
As far as breathing always suggest to people to breath normally.