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.

Supposedly and I think this applies to all the German marques (BMW, Mercedes, Audi, VW, possibly Ford), the engines are tuned for Ron98. Using a lower octane fuel means the engine will retard itself to prevent knocking, meaning lower performance numbers and I THINK all the engines are shipped from Germany or from some factory located in EU. I do not think they are specially programmed or tuned to use our fuels here as evidenced from some of the dyno charts I've seen.

It's definitely in the best interest of these owners to pump in Ron100 as this should allow them to bring out the best in their engine.

Technically it should benefit - the Skyactiv engines that is - it all depends on how they tuned the engine for the local market.

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!

I think the owner already has ron100 in the tank and it was stated the map has switchable settings.

First it was dynoed using Ron97 map settings, then they switched to Ron100 map settings and ran the Dyno again.

That should explain the timing of it.

You're right, I should be more specific

It works for tuned cars, actually I should say, it works for cars that are tuned specifically to make use of Ron100 fuels. If the timing is set to just ron97, then it won't be able to take advantage of the higher octane fuel.

Can fill ron95 and above.

The question is what octane fuel is the ECU is optimized for. Stock cars are tuned to accept a range variety (min - max), if it is localized for Malaysia, then the minimal range should start from 92 (for older cars) to 97. Therefore, pumping ron100 will yield little to no additional benefits.