There's certainly some truth to that. I recently got a proper battery analyzer in order to explore some battery-related questions that I've not been able to find good answers to. Based on the discharge curves I'm seeing, I'm generally only using the top 1/3 of the capacity of my cells. That's OK though because I only swap batteries in my ADV mod once a day, and less frequently than that in all my other mods.
I do the same, if using a mech. I get down to about 3.65 resting voltage, at the lowest. point on the other hand, if using my topside, I run them down to about 3.45. after that, because of drop, low voltage protections start to cut power to the coil, dropping into a kind of bypass mode untill cut off voltage.
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