How many ml, generally speaking, does it take to fill an un-modded standard M402 cart, i.e. not an XL or an EVO? I'm trying to crunch some very rough budget numbers, and part of the crunching involves figuring out how many carts I can fill from how large a bottle of juice. Your help is needed because so far I have all the actual vaping hardware, but nothing (yet) in the way of syringes or other measuring equipment. I also have a lousy eye for how many drops = how many ml 
I also don't currently have enough empty carts to just fill them til a bottle runs empty and do the math that way.
I'm not asking how long a cart will last me, because I'm still experimenting with strengths and how fast I personally will go through a single cart. Apparently there's a lot of variance in cart life between individual vapers.
Any help you can offer is greatly appreciated, even if it's advice for how to figure this out rather than just hard numbers.
Thanks!
I also don't currently have enough empty carts to just fill them til a bottle runs empty and do the math that way.
I'm not asking how long a cart will last me, because I'm still experimenting with strengths and how fast I personally will go through a single cart. Apparently there's a lot of variance in cart life between individual vapers.
Any help you can offer is greatly appreciated, even if it's advice for how to figure this out rather than just hard numbers.
Thanks!