70VG/30PG is sort of the norm as far as I know. Although it can vary a lot. 70/30 is the lowest I do, my favorite juice is 80/20 and I got a nice juice the other day which was 85VG/15PG I was surprised that it didn't gunk my coils because the 80VG one I use does.
Burning coils out isn't anything to do with it being high in VG it just causes gunk. Generally burning coils out is down to constantly using high power on them and keeping them wicked and saturated. This is why I use temp control then you can't burn your coils out.