I'm running RON 95 for 5 years after engine overhaul now. (Cracked piston) Lets just say that u need to do a few adjustments to milk everything out of RON95 fuel. But i'm running carburetor and i have the luxury of playing around with numbers like O2 machine and such. I believe all ECU can calibrate itself to make use of RON 95. Of course bigger RON number does let u make big HP. But i have always seen in USA those stock drag cars that use RON 91 can make 600hp and when use premium like RON 98 can make 700HP.

So comes to the part that those are high end drag engines. On our engines that usually make 100hp more or less, actually barely noticeable difference. Unless if we could have an engine room, fill one up with 97 and one with 95 and let them idle and see who finishes first. Then do an engine dyno. There will be difference here and there. So whose game?

Er...... engine oil thread another place la... haiyaaa..... here they talk about petrol.