RON95 have no issue laaa Proton Saga (Old)/Iswara and Wira (Carb) is tune for RON91 (Due to thailand requirement) if not how on hell you drive your car to Thailand cross border over there there is no such thing as RON97 and they pump RON91!!!

all car authorized manufacturer seller (ASEAN country) is compatible with RON91 (minumum requirement)

All recond car (From other country AP car)
-Europe country (RON92 minimum) - supermarket grade, except sport car
- Japan orgin (JDM cars) - (RON95/97 minimum) as Japan lowest RON is RON97 and their premium fuel is RON99 (If car has knock sensor RON95) expect horse power reduction
- US orgin car (RON 95) minimum

RON97 only car

Modified car like Kancil Turbo (Transplant from L2000/L5 etc etc) RON97 min as Car in Japan is RON97

Honda Civic Type-R : RON97 minimum *Recomend by japan RON98/99
so Shell V-power works here

Performance/sport car better RON97 since you guys can afford it

Those who transplant engine (half cut from Japan) prefer RON97