Sure, but when are they added? At the gas station? Who adds them? The truck driver?It's all about the additives that are added.
There's a BP at 15 Mile and a No Name station across the street. The No Name also states it gets the BP hauler to serve them. But what's inside that hauler's tank at No Name is a different, lesser additive blend.
Some vehicles get by on cheaper blends. Others need more. Some vehicles show rough idles at 20k - some don't using the same exact gas. Do a 20k experiment at each. That will give you a better answer to their ratings, as seen fit by your specific vehicle.