They will usually let you chose up to 70/30 because, at least, 30% of it is pg based flavor. Most people get it at this ratio because it is the highest you can get without premium prices. Vg based flavors are are made by 2 companies and are nearly double the price, even when bought wholesale. PG is used to carry flavors in most "foods". The flavors blend more easily with vg because it's thinner. There are only 2 flavoring companis, in the world, that offer vg based flavor additives. Lorann is one of them. Most of the people I know these days vape 80-100%vg. Much less throat hit when you are vaping sub-ohm or high wattage.