The Smoktech LR XLs hold nearly 2 ml. Somewhere between 1.75 and 2 ml. When I fill an empty carto it takes 50 to more than 60 drops to fill one.
I use only stainless Smoktech cartos now. I can taste the plastic from the clear cartos. It may be my imagination, but I can taste the clear plastic.
I use mostly the Smoktech single coil 2.0 ohm LR XL. I also use the Smoktech single coil 1.7 ohm LR XL once in a while. Both produce about the same amount of vapor on my 3.7V E-Power 14650 but I prefer the slightly cooler vapor from the 2.0 now. I used to use 1.7 ohm most of the time.
The Smoktech dual coil 1.5 ohm XL runs cooler than the single coil 2.0 ay 3.7V and takes a lot more battery power to run. The dual coil is actually two 3.0 ohm coils in one carto.