On most of the product descriptions it states "We recommend an even VG to PG ratio for best flavor and vapor production."
Their site also says this:
"VG/PG mix recommendations
Every flavor has been tested at various voltages/resistances (wattage) and below is a short list of general recommendations.
For dessert including chocolate flavors, we recommend a slightly thicker mix (even to higher VG ratio). Desserts are generally heavier (real desserts) and VG helps to recreate that fuller mouth feel and overall experience. VG also helps to sweeten e-liquids to a certain degree.
Fruits are generally lighter in feel, so an even or higher PG ratio is recommended.
Tobaccos can go both ways, but in general we think the best flavors are more pronounced at a higher PG level! The same goes for the various tea, coffee, and other beverage flavors we have to offer.
Some of the ratios above will not work on cartomizers, tanks or anything that uses a cartomizer - for instance thicker VG e-liquids will not wick on most cartomizers. All our higher VG testing is done using our own low resistance atomizers or Cisco atomizers, while the higher PG mixes are better suited for cartomizers and tanks. More on hardware below."
E-Liquid recommendations