Left is Shell Super. Right is Shell Regular
If u r using Petronas, they also got 2 variance of fuel. Primax which is RON97 & Prima which is RON92. Again, Prima is not leaded fuel. It is unleaded fuel as well. If ur living in Putrajaya, u can try using the RON95 at selected Petronas there. Selling at RM1.70/liter.
If ur using BH Petrol or Caltex, they also are selling 2 kind of fuel. Which is Silver 92 & Gold 97. At first I thought that the 9 is the latest compare to 92 due to its resemblance with year '97. Heheh...was I really wrong eh? hehe.
So now since u already understand (kinda of) what kinda fuel that all along ur using, can u change it from using RON97 fuel to RON95? Definitely yes if ur car r make after year 2000. Most of the vehicles nowadays r using EFI or Electronic Fuel Injection compare to b4 year 2000 where most of the cars previously using Carburator. It is actually no harm at all if we use RON95 unless u dont care about the additional cost of using RON97. But if u want to use RON95 and ur car r using Carburator, then you need to add ignition timing adjustment fix in order not to make ur car hick up.
For further info, please refer to other related posting i.e. Paultan etc.