This is my opinion regarding top tier. Yes, top tier is a performance standard and it costs money to certify your additive. It's also my opinion that some retailers that are not listed as Top Tier are still just as good. For instance RaceTrac. RaceTrac is among one of the retailers I purchase fuel from and I've never had any issue with their gas. In the DFW area RaceTrac is everywhere and a lot of their stations are newer. I also like RaceTrac because they deliver fuel in their own trucks for the most part, Love's and Pilot also do this. They run a tight operation. I literally have no qualms about using fuel non top tier from trusted retailers. RaceTrac, Buc ee's, CEFCO, Pilot, Love's, etc. I've never had any issues with their fuels.