I guess there are some advantages to tootle puffing on the pinch with a 0.7 ohm single coil MM. <=Gee, did I say I was tootle puffing at 0.7 ohm?.....my how things change in such a short time=> I get about 4ml with my old AW1600's and a full 6ml bottle (could maybe even go a little longer) with my HE2's. I was surprised that I was changing the HE2 batteries at 3.4V and didn't have a smack me in the face change but rather a modestly stiffer hit with a fresh battery.