actually its neither. I mean no one ever fills their glass to the BRIM.. and thus a full glass isn't quite to the very top. So when you fill it to the "half way mark" its not really half way. So in all technicalities, I simply cannot answer this question.
Besides.. when I get a large glass of milk.. I dont judge it by how much is in the glass, but how much just used to be in the jug... as it really drains the gallon
