The recommended VG/PG ratio for e-liquid in sub-ohm devices is high VG vape juice, which usually comes in the form of shortfills, allowing you to adjust nicotine strength as required.. In general, the guidelines for DTL suitable vape juice are:
60VG/40PG will give you good flavour and a bit of a throat hit with decent clouds.
70VG/30PG is the most popular ratio as it provides the optimum balance of flavour and clouds with a smoother throat hit.
80VG/20PG is becoming more common and popular - expect steam train levels of cloud production!
90VG + is pretty rare as we are yet to find many brands that can still deliver good flavour alongside the dense clouds - watch this space!
Not all sub-ohm tanks are created equally. It is a good idea to be mindful of the size of the wicking holes found on your coils. Higher VG e-liquid is more viscous and may not feed properly to the coil if the wicking holes are too small.