I honestly can't tell the trolling from the honest interest in this thread.
Gasoline volatility is controlled seasonally, NO terminals segregate "no name" gasoline for 60 days minimum, it would be in big, big trouble with the EPA & DOJ if that occurred, especially in summer. Gasoline moves from refineries to terminals in less than a week on average, the closer a terminal is to a refinery, the shorter the delay. Quality is checked before a refinery ever transfers a shipment to a terminal, including terminals directly at refineries. This is true whether the product is shipped by pipeline, railcar, or marine transport.
Additive injection is metered and instrumented, and has provided an audit trail for EPA reporting since 1995, same type of instrumentatoon is used for Top Tier as "no name" additive blending.
The same is true for ethanol addition these days and has been for some time.
Tankers typically have multiple compartments for hauling multiple grades. Trucking operators have good incentives to optimize their deliveries.
I've posted the Colonial Pipeline rules on additives allowed and additives not allowed in yheir pipeline transport, which is a typical list. None of the detergent additives are permitted in pipeline transport, there are solid reasons of chemistry they're added as a cargo is being loaded for station delivery, same as ethanol. Now Top Tier has added another good reason.