Maybe it's more of a placebo; you're more likely to drink the 20oz bottle quicker than the 2-liter. An open (even re-capped) 2-liter bottle will lose carbonatio

Maybe it's more of a placebo; you're more likely to drink the 20oz bottle quicker than the 2-liter. An open (even re-capped) 2-liter bottle will lose carbonation over N days quicker than a 20oz you drink in maybe an hour or whatever (at least that's how I see it)