Talk:Oxy-Fill

"a petroleum fuel business"

Is it ? 'Oxy'  might instead (or also) imply simply oxygen refills.

If you burn fuel you will need an oxidizer of some kind (so possibly its refills of both ??)

And as a fuel it might not even be 'petroleum' as there is no source for that in Rapture - is there? And it is something that does get used up (self-sufficient). Could be some other fuel locally produced like methane.