simple to think is like this

less knock = timing more advance = more power
more knock = timing retard = less power

octane is basically how well the fuel resist knocking.

higher the grade the more resistive it is.

just my 2 cents

yes.. i lazy type so long ma

actually abt the cfe is not really accurate. turbo car has less compression ratio coz you pack more air in the same amount of space. so you cant compress it too much without it giving you other issues...

yeah....it will run fine on low RON if normal drive
but if want high speed drive, better use higher RON fuel cuz it push the HP to the limit
but truthfully la...our RON95 really is problematic..no offense...especially the shell one
esso/mobil one still the best
now that RON97 reduced to RM2.6...these few weeks i pump half 95 half 97(same amt of RM), the FC is the same as full 95(despite having lower Litre)...and dam, that power feels good, and the engine is so quite and smooth
i always wonder why 97 and 95 difference is so big

shell

dont use ron95 for modern car .. our ron 95 is same with 92+addictive  .. it was the gov who ask the fuel maker to come up with a low price fuel but better then ron92 .. old car carburator is ok to use ron92-95 -97 new car with fuel injection no no no.. did u notice they is a lot more car with their bonnet paint tearing off due to heat problem??

i once saw an old article on the shell website regarding the launch of the first ever vpower... and it stated that by law...maximum RON in malaysia is 97.

so the Vpower racing is 97 with additional additives.

tried finding that article again so many times and still havent been able to find it...

we know how engine and ron work .. dont know how our gov work .. can u check our ron 95 whether it is in correct ron or not ?? or simply just ron92 + addicctive?

i'm keeping my 2cents to myself by not choosing this oil.. but some ppl just not happy about it .. dont know why ??

This is not the worst I have heard about RON95, I've heard more hilarious comments like "RON95 make your engine consume engine oil and then damage the whole engine where you need to overhaul it".

Unfortunately, for most road cars, the ECU is only self adapting downwards. It will not increase the aggressiveness of the ECU if you give it better fuel but it will retard to protect itself if there is something wrong with the fuel.

Therefore pumping better fuel into an ECU programmed for RON95 will not give you increased performance. I have tested this with my own car. If I don't change the baseline settings and leave it at OEM factory, even if I pump RON 97, it won't increase the aggressiveness on its own. Human intervention is required.

The only way to increase performance is to change the baseline settings in the ECU for a more aggressive setting. I'd pump RON 97 and keep increasing the aggressiveness of the ECU until it starts to retard on it's own and then download the logs to monitor (I don't like driving with the notebook connected to the OBDII port) and fine tune the settings. That was when I was a noob until I found the hundreds of ECU map available that were dyno tested and I could download them for free into my engine. Now no not much testing needed. Just pick and choose the map I want.

This is the reason why most cars don't get a performance boost when using better fuels and only retards on bad fuel as the ECU is made to tune down and not up.

It will adjust downwards but I didn't say it will stay there permanently. It will adjust back to factory default but most will not go above that.

It most probably wouldn't even affect the engine. Unless you have a high tuned or high strung engine, the lower RON will not even affect it as the ECU mappings might be so sedate that a lower RON will not cause any pinging at all. Highly tuned engines are more sensitive to RON levels than those engines you find in normal cars.