Yeah I think I'm about the same as distorto, maybe 2/3 - maybe almost 3/4 a bottle with r4's but I usually just switch out at 1/2 a bottle. The tube through the center of the bottle takes up ~ 1.25ml though so even filled to the brim your getting 7.25ml at most, leave a decent air bubble and you're at a little less than 7ml. Only way I can get through a completely full 8.5ml with no tube is with dual 18650's, then I got a little power to spare when the bottle gets to completely empty using the full 8.5ml. On average I'm guessing at somwhere around 5ml per 18650 with 2500mah
Has to have something to do with the viscosity of your liquid. I'm getting a full on 8mls with 50/50 filled to the neck. The graduated cylinder does not lie...
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