Hey Nate, I went to smog school too and got my smog license. It was back when Costco (then Price Club) did smog checks. Nowadays, all gas, regardless of the brand, comes out of the same pipe. Each brand will add its own additives( if any) before it reaches the station. Costco, on the other hand, has a separate tank at each station just for its additives. When the tanker truck comes to make a delivery, we manually pump in the additive based on a percentage of the fuel delivered. On a good day, we'd get 6 loads of 8000 gallons each just at our station. With 24 islands, we can sell 4000 gallons an hour with cars lined up to the street and around the block. Even then, it was still kinda boring working out there, and avoided it whenever possible.