Fella I know drives a tanker and delivers all over the country, I asked which is the best site to fill at? He said that a bulk tank ship lands into the port and fills the topaz, top, Esso bunkers, the branded tankers for Esso could fill from the topaz bunker and vice versa.... So what you get in you topaz station may in fact be "Esso" petrol
Or it's all the same in other words