According to Scotty Kilmer on Youtube there is nobody who actually checks to see if the additives claimed in Top Tier gasolines are actually there or in what quantities if they are. All of the different gas stations get their gas from the same place. It's only what's added that differentiates them. Make of it what you will. I only repeating what Scotty Kilmer said. I always buy Top Tier gas but annually use some Gumout with PEA or Techroline.