it's the knocking problem that caused problems...

95 caused more knocking % than 97 and it can cause serious damage to your piston and block...

however this is depends on luck, some driver no prob at all but some did...

Technically speaking, octane grade is how much the fuel can be compressed before detonating without a spark, which causes knocking. The higher the grade, the more it can be compressed before combusting without spark.

This is why the 1.6 Campro CFE engine has less compression ratio than the normal 1.6 Campro, to accomodate lower RON petrol in other countries.

beats me, i have the same thought too. But this really happen and even 2 of my friends car. merc forgot which model and the other one is vios

yep..turbo already have high pressure. so the compression ratio must be lower compared to na engine. thats why if want to bot na engine..need to use low compression piston(if the boost is high).

According to the Lotus Proactive Magazine 

http://funtastickodesign.files.wordpress.c...ssue_43_web.pdf
But you are perhaps correct as the fact that it is a turbocharged engine was probably also taken into consideration.

I loled when know City must drink ron97..

imho, my neighbour uses Honda City...always fuelled Ron95...

so far no probem at all..

And how the heck does fuel damage the throttle body? How can the fuel damage any parts that it does not come into direct contact? Might as well say that by just driving the car on the road the paint is being worn off by using RON95 petrol.               

Yeap.. something else is wrong the TS car.. and not the fuel.