I was running of information i sourced from the net, although what ur saying may be true, it may also be true that yeah sure bp have additives but that the 98octane fuel is mixed independently whereas the other fuels may take 95octane fuel and then add more stuff to make up to 98. A personal opinion i'm making about what information i've gathered.
You should find out what base stock does BP use to make that 98 octane.
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