With the available ingredients, I have faced some issues to reach a round ratio (60/40) and ended up with 59/41.
Here is why.

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Base ingredients:
- 100mg/mL PG based nic [PGBaseNic]
- TPA/TFA flavors PG based [PGFlavors]
- 50/50 PG/VG mix [PG/VGBase]

Ingredients of Base nicotine 18mg (66.67% of total) [BaseNic18]:
18% [PGBaseNic] : 82% [PG/VGBase]
[BaseNic18] PG/VG ratio => 59 : 41

Ingredients of Flavored liquid base (3.33% of total) [FlavorBase]:
82% [PG/VGBase] : 18% [PGFlavors]
[FlavorBase] PG/VG ratio => 59 : 41

Final recipe [Final]:
1 [FlavorBase] : 3 [BaseNic18]
[Final] PG/VG ratio => 59 : 41

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Steeping method:
- 1 hour hot bath breathing
- 1 week in the dark (bottle closed, shake daily)

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Been my ADV for a month, great feedback from friends who tried it.
Inspired by: e-liquid-recipes.com/recipe/11799/Old+Toby
Reason for the adaptation: too strong DeKang aftertaste.