Costco is P66 fuel aka "76" gas unbranded of course, at least in Socal. I use to load next to the common carriers who went to the Costco stations. That was before I got out of the game of fuel hauling about a year ago.
Up in Northern California, we usually would load Costco gasoline on Tesoro pull points. Other times it would be on Shell, but that was rare and probably just a backup when Tesoro was out. We loaded it at the Tesoro refinery.
This guy probably did it right. I"m also about to get out of the fuel hauling game. There ain't no place in this industry for a guy like me, no sir... nothing but trouble. Heh.
Yes says it right under where it says arco on the door. Kind of slick, like it's an arco truck but not really lol.