Big BP place up here where the gas is piped in. I had a repair call there one day and got to chatting with the guy there. They will sell gas to anyone that wants it. All the additives in the gas are added right at the terminal that fills the tankers. Depending on what all you want in your gas is what gets put in that tanker. BP stations ( franchises) are required to buy the gas with the additives that make it BP gas. Other stations do not.
Sent from my boring Droid phone.
This is correct, I have spent the last 15 years working offshore oil and gas.
We will use gulf of Mexico.
The oil is drilled by many different companies, like BP, Shell, Murphy, Hess and more. It then all goes into the same pipe line to take it to shore. So its all mixed together no way to know who drilled what. Once ashore its piped to various refineries such as BP, Shell, Exxon, Hess, and more. The refineries all produce gas, but its slightly different formulation based on the region or area of the country its going to. They all have different blend requirements, mandated by the state or area. So gas for and area will get piped to a distribution center or terminal in that area. Again in the pipe its mixed with other refinery gas as long as its for that area.
Once pumped into the tanker truck, the brand specific additive package is added. This is when it becomes BP or Shell or Texaco or so on.
The difference is in the additives. And yes the additives do make a difference, and do matter.
I only use Top Tear gas, it has better additives.