I also feel RON95 no good for my car...

Maybe u drive Insight u dont see any difference cause its already low performance anyway?

just dun come and say i buy my new car at 2005. pump RON97 all the time, travel a lot with RON97 without problem. after 5 years, switched to RON95, then car start to be hotter, gasket blow, aircond not cold. is very obvious edi why.

The Mother of all answer you suc*ed at maintaining your car... slso the warranty is over and your car is old... things that move tend to brake....

har?? your insight old already the ceramic brake system will brake itself ?

and your car is???

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Added on August 2, 2012, 3:33 pm

The Mother of all answer you suc*ed at maintaining your car... slso the warranty is over and your car is old... things that move tend to brake....

your car RX8, of course la

dude, US of A still using RON91 but never heard they have engine problem due to the RON they use. They even run on high powered car like EVO and what I've read from their car magz,  a 400whp EVO8 running on RON91 without issue. The key is tuning.

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Added on August 2, 2012, 2:12 aminb4 their RON91 is higher grade which match with our RON97

i stopped using Shell95 cos my car underpowered like shit... some more engine roars so loud like it wants to die

Petronas 95 better, i will pump RON97, almost every 10 RON95 fuel ups

He's asking how you come to the conclusion that compression ratio directly determines the RON usage. The site does not explain that because compression ratio is just a static component measured at TDC. Static compression ratio alone does not determine the RON usage.

Ignition timing plays a bigger part as the more aggressive the timing, the higher the RON is required to prevent detonation even though there is no change to the static compression ratio.

As for CPS lower compression ratio, that is not due to reduced timing as stated by you.
Every engine can only have 1 static compression ratio as that is determined by the shape of the piston. In the CFE, the piston is changed to reduce the compression ratio from 10.1 to 8.9 without changing the length of the conrods. Ignition timing DOES NOT change static compression ratios. Therefore the campro CFE static compression ratio is 8.9 and not a variable 8.9 to 10.1. THis is static compression ratios we are talking about, not dynamic. That would be another story and another topic.

shell promotes fuelsave 95. they purposely make their fuel underpower so that it discourage u from going faster, flooring the pedal harder and burning more fuel, how u think u can save 1 litre for every full tank poured ?
im still waiting for 50 cents coins to follow my car.... so far no luck..

Wow suddenly this topic become hot again. Ok guys despite all the theories, do you realizes (some of u will shoot me for this question). Using Ron 95 your engine bay gets hotter? I meAn just stand infront of your car after a drive. U will be surprise to feel the very  warm heat that I never experience before when I was using 97. I have been using 97 for a year. Then try out 95. No doubt 95 makes the the engine raw and no power and sometimes I can hear my engine pings. I have been using 95 for 6 full tanks. I can tell that 95 is not a pleasant fuel to drive. It just make too much noise and sluggish. In long run it may damage my car. After using back 97. Everything goes back smooth and normal. Oh yeah and the engine bay warm temputure. When back to normal. No more very hot sensation.

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Added on July 30, 2012, 1:38 am
Is it 98? That is what I heard.

then ur car can use ron95 mine dont know why cannot .. i travel a lot before the launch of ron95 my car no problem not new car second hand local car .. before the ron95 use for 5 years no single problem service every 5k fully syn .. after ron95 use no more then 2 years gasket blow . oil leaking from distributor .. engine become hot . some will say it is coincidence .. i dont know i just dont trust our ron95 .. ur car use ron95 no problem u can continue to use i didnt force u ..

now my old car still use ron 95 bcos already know what need to service every year before the problem come out..

new car no ron95 ron 97 all the times .. u say it a waste to use ron97 if the car can use ron95 . not for me .. i rather pay extra now then have problem later that all .

Just switched to shell RON97 after using RON95 for 1-2 years(Honda City), the different in term of power is obvious enough and engine is more silence compare before.