Originally posted by knb89:

there's also standing blue burning iron torch that uses Greydwarf eyes as fuel. 6 to be exact. I've played multiple hours with them burning without actually having to replace the fuel yet. Definitely love the look of them as well as the green burning torch.

Yeah, I've got that. This is why I wonder if there's any difference. But I CBA to hang around to see which goes first. It *feels* like I top these up less than other sources, but can't be sure.