Actually this was a thing with some finicky vehicles like ones with multi-carburetted engines. Decades ago it was still quite common for the retailer to be consistently supplying the output of a single refinery. You filled up with the top premium gasoline from a well-promoted brand, then spent a lot of time under the bonnet adjusting the carburettors and the corresponding ignition characteristics for that exact fuel. Then refilled the tank at the same retailer whenever possible.
Actually this was a thing with some finicky vehicles like ones with multi-carburetted engines. Decades ago it was still quite common for the retailer to be consistently supplying the output of a single refinery. You filled up with the top premium gasoline from a well-promoted brand, then spent a lot of time under the bonnet adjusting the carburettors and the corresponding ignition characteristics for that exact fuel. Then refilled the tank at the same retailer whenever possible.