Performance CBU japanese cars like the Civic Type-R is tuned for higher RON fuel such RON100, therefore the same theory applies to Swift Sport (M16A engine with extractor). Same goes to turbo ones like Mazda CX-7 & etc. Therefore RON97 is the choice since this is the most premium we have got.

Higher RON can mean nothing but also can also mean something to a car, for example performance, fuel consumption & etc. This something only can be verified by thorough research & testing. The problem now is that we are paying the same petrol price but for lower RON fuel. So people, you decide whether we actually gain or lost? No need to debate further