That's why I'm
Luxfor buoyancy: -1 and 1.2, old; compared to -1 and 1.3, new.
Doing the actual arithmetic, the new bottle is .43" wider and 2.55" shorter, so that's more significant than indicated with first look. However, it is not intuitively obvious to this casual observer how that impacts. (not trolling, I just don't get it.)
Edit: Are you guys discussing the differences between Luxfor old and Luxfor new? Or between the Catalina and the Luxfor new?
It doesn't help that different websites have different data for the same tanks.