I did a rigorous 10 minute google survey. It turns out there is an industry standard kind of group "Top Tier" in which about a third of national brands are deemed to be at this "better" level:
http://www.toptiergas.com/licensedbrands/
AAA decided they actually were better, in independent testing, and -- in some otherworldly coincidence -- their story announcingn this testing was the source of the numbers in xoB's original post:
http://newsroom.aaa.com/2016/07/aaa-...created-equal/