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Message: <blockquote data-quote="shiroitenshi" data-source="post: 1063336305" data-attributes="member: 27518">Those are non ignition adjustable cars, as they run individual coil packs so they have to depend on the knock sensor to retard ignition, it's a response system, it retards at the first sign of knock so for cars that already run high ignition timings, the first knock may be permanently damaging. For older gens, the timing is adjustable via the distributor, and the initial setting for most old gen honda are set conservatively, and doesn't really knock easily/excessively unless unreasonable loads are forced on them (hence the statement of being stock)The higher you are from sea level, the less octane is needed, due to lower air pressures at higher altitude which reduces compression in car engines. As most of us live near sea level, we can't run away from using higher octane.So Honda Malaysia is right on not recommending RON95 on those cars.Then again, Cali users have been stuck using 91AKI/95RON for ages.. it could be that their stock ECUs are mapped for their climate, and considerations of locale. They also have region specific models, so I can't say for sure about newer generations of hondas like you stated.Actually for more info, you can call up Shell and Honda Malaysia, and they do entertain these kinds of enquiries.. just that most people don't know about it. I know Shell has a customer service line for these enquiries.. not sure for other fuel companies as I've only talked to Shell people about it.Shell Customer Servicehttp://www.shell.com.my/home/content/mys/footer/contact_us/csc/csc_contact.html</blockquote>

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