I've never purged and have not had any issues after switching to a high quality butane (I use Vector 14) in any Kiribi or Corona lighters. I've had about 70/30 performance in the past with Xikar lighters but that was with different fuel. I've had mostly bad performance with Colibri lighters. I've got a couple of cheap Vector lighters that I haven't used enough to be able to tell.