>run your car on single origin gasoline. Actually this was a thing with some finicky vehicles like ones with multi-carburetted engines. Decades ago it was sti

>run your car on single origin gasoline. 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.