Only tuned engines or performance cars will benefit from the high octane rating of the  fuel.

However, to really notice the difference, one will have to ensure the petrol within the car tank no longer carries Ron95 or Ron97 fuels. So an accurate report will only be available once someone has pumped in the 2nd or 3rd consecutive tank of Ron100 petrol.

Even the graph looks smoother. If you examine the graph posted by KT, you'd notice even the engine retardation is less.

So myth confirmed! At least for VW cars, the use of higher octane fuel is definitely beneficial!

While we may not know about the effectiveness of every manufacturer’s engine electronics, we are relatively sure that BMW’s systems do not take advantage of a fuel that is more stable than RON 97. What we’re saying is that you could pump RON 100 into a BMW, but it is highly unlikely that the stock electronics can make use of that extra fuel stability and produce more power as a result. If we are talking about aftermarket tuning and mapping then perhaps there may be some advantage to it, but for now RON 100 is likely to benefit only high end sports cars and modified machines. As for the rest of us, RON 95/97 will do perfectly fine.

To answer your question, there are no cars sold in Malaysia that needs RON100 on their stock settings.

Ron100 just came out. All stock cars even the premium one requires min RON97. Putting RON100 may not get that additional boost.