That talk about Shell RON97 is BS. I used it on off ever since i got my City in 2017 and even last year was solely running on Shell RON97 so I know first hand its all crap. Denso (Honda supplier) cost down kaw kaw with inferior made in Indon pumps but they didnt want to admit it. This also affected many other Japanese affiliated brands: Toyota, Perodua, Daihatsu, etc

I have been complaining this on my Civic, on the City also got same issue. I’m guessing it’s the gas pressure because each time I complain they flush the gas and refill then it goes away for a while.