I work 2 blocks from a gas truck filling pipe line/ tank farm/ sip unloading point... I see all brands of gas trucks go by, speedway, marathon, bp, Mobil, off brands, snoco, The only brand I do not recall seeing is shell, but there are only a few around here and I think they get it from a local non branded tanker.
Each truck could still have a different blend put in but that is mostly just smoke and mirrors. one brand of additives to another is no different. % gas vs ethanol does change somewhat but all the stations around here us 10%. Walmart gas just sucks MPG and performance. about 8% for me. Same price but worse quality or additives. things like lawn mowers run badly on that gas
