Before the Chinese flu lockdown, I purchased virtually all my gasoline in WA state. Even for my sorry ass vintage bikes, heavily allergic to ethanol, 0% ethanol 90 octane at a specific gas station in Lynden , were very happy with it. I cannot say I could notice any difference between Cdn Shell 91 or US 76 90, either fuel economy or knock resistance. I am of the opinion that Chevron 94 is a good product in that it has a single source pump , and it is 0% ethanol, but, IMO, it’s ‘octane’ rating , and resultant higher cost is not needed for any but the very rare high compression vintage (read archaic combustion chamber design) car and bike engines.94 in BC has about the same knock resistance as Washington 91.
The US is a shit show for fuel consistency though, they're all over the place in quality. Which I'm sure you've experienced.