It’s probably because the unleaded is really old 3 star petrol and cars just about run on it.
If you had an old carb car it would pink and run shite. That’s why you can only run 97ron.
Newer cars with ecu aromatically reduce the timing for 95 and advances for 97. This is why your car has a flat spot. Just use 97 all the time: tup: some cars don’t advance so you can run on 95 and 97 don’t make any difference at all.
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