Anything is posssible, although the jug I use is fairly new and all of my fuel is kept inside unless I'm at the field. I just checked one of the PM cans and the volume is listed a one gallon, 3785ml. I have a friend who is a forensic chemist and I'll check with him to see if he can measure one of these cans to find out. I am sure that he can, but when he can do it is another issue. Maybe another unexpained mystery will get solved..