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Well_is_it
When talking about the premium fuels you also have to look at the additives/detergent mixes in with the fuel.
All unleaded petrol grades are the same distilled oil the only difference is the additives/detergents that different vendors add. If you want proof, how many oil distelleries companies are there.
Finally it is in your head, as has been mentioned a few times on this thread.
If you are bored, find a cut up open anti knock sensor to see what it is then look how many cars have them.
Do shell still do the 100 optimax?