Originally Posted by campclan
My Brother in law drove Gas Tankers for years believe or not all gas comes from the same place just the additives are different. Shell truck pulls right in after a Chevron Truck etc. Costco or Kroger gas comes from the same place just add techron or STP or something of the like if you want. If your engine is pinging then you need to add something as that pinging is very bad for an engine. I was a Mechanic for awhile and sometimes I saw things that were a result of bad gas or poor maintenance. Ethanol is tough on seals and using a stabilizer when parked is good advice.
I worked for a major oil company. The vast majority of tankers are filled from terminals connected to pipelines. All the refineries feed their gas into the pipelines. When a tanker fills up the additives for that brand is added. Now Amoco, now BP, refined its premium so it was cleaner than most other brands. That would be delivered from the refinery or a line not shared with other refineries.
I have been told Costco is serviced by BP.