Most people vape high PG like 80/20 right? That seems like the "default" mix sold by vendors.
According to the polls, 50/50, followed by 70pg/30vg are most popular. I vape 70pg/30vg.
Poll results graph here from 629 voters.
http://www.e-cigarette-forum.com/forum/polls/177395-what-pg-vg-ratio-do-you-like-best.html