[PcPhobic]

Found the following posting at http://hondaswap.com...-ratings-59435/

Originally posted by E_SolSi@Jul 17 2005, 12:48 AM

In Europe 98-octane gasoline is common and in Japan even 100-octane is readily available at the pumps, but this octane nomenclature is misleading to Americans as foreign octane ratings are derived entirely differently from our own... So, like every other measurement system it seems that everyone else uses a different scale than we do, but unlike most other instances where we have had the good sense to create different units of measure in this case we all use the same name...
Japan and Europe use a system called RON or Research Octane Number to determine the octane rating of their gasoline, while stateside we use a system called AKI or Anti-Knock Index to determine gasoline's octane rating... Interestingly, to further complicate things it would seem that our own AKI system is actually derived from the average of the RON system and another more complicated system referred to as MON or Motor Octane Number... So, to recap our methodologies for measuring gasoline's octane rating are different, but share some common elements...
So, with the commonality of RON in mind a good rule of thumb is as follows, multiply the foreign RON Octane rating by 0.95 and you will have the US AKI equivalent.

( RON Octane Rating x 0.95 = AKI Octane Rating )
98 RON Octane x 0.95 = 93.1 AKI Octane (US measure)
100 RON Octane x 0.95 = 95 AKI Octane (US measure)

So, as you can see the 93 or 94 octane fuel we are all paying an arm and a leg for is actually quite comparable to the higher octane fuels found in Europe and Japan. The people whom have to worry about low octane rating are our friends out west in places like California that are subjected to substandard 91 octane.
91 AKI Octane (US measure) = 95.5 RON Octane

[vr2turbo]

Found the following posting at http://hondaswap.com...-ratings-59435/

Originally posted by E_SolSi@Jul 17 2005, 12:48 AM

In Europe 98-octane gasoline is common and in Japan even 100-octane is readily available at the pumps, but this octane nomenclature is misleading to Americans as foreign octane ratings are derived entirely differently from our own... So, like every other measurement system it seems that everyone else uses a different scale than we do, but unlike most other instances where we have had the good sense to create different units of measure in this case we all use the same name...
Japan and Europe use a system called RON or Research Octane Number to determine the octane rating of their gasoline, while stateside we use a system called AKI or Anti-Knock Index to determine gasoline's octane rating... Interestingly, to further complicate things it would seem that our own AKI system is actually derived from the average of the RON system and another more complicated system referred to as MON or Motor Octane Number... So, to recap our methodologies for measuring gasoline's octane rating are different, but share some common elements...
So, with the commonality of RON in mind a good rule of thumb is as follows, multiply the foreign RON Octane rating by 0.95 and you will have the US AKI equivalent.

( RON Octane Rating x 0.95 = AKI Octane Rating )
98 RON Octane x 0.95 = 93.1 AKI Octane (US measure)
100 RON Octane x 0.95 = 95 AKI Octane (US measure)

So, as you can see the 93 or 94 octane fuel we are all paying an arm and a leg for is actually quite comparable to the higher octane fuels found in Europe and Japan. The people whom have to worry about low octane rating are our friends out west in places like California that are subjected to substandard 91 octane.
91 AKI Octane (US measure) = 95.5 RON Octane

Bro. Pc,
Don't quite follow your posting?
So what standard are we following? Japan RON, US AKI or our own??

[VinPetrol]

Bro. Pc,
Don't quite follow your posting?
So what standard are we following? Japan RON, US AKI or our own??

Malaysia, like UK, uses Research Octane Number (RON), right?

[PcPhobic]

Bro. Pc,
Don't quite follow your posting?
So what standard are we following? Japan RON, US AKI or our own??

What prompted me to find out is bcs I have a colleague who downloaded the manual for his Toyota Celica (7th Gen) from a website in USA and in the manual it told him that RON 92 was ok for his Celica.

But Toyota Celica (7th Gen) engine is a high compression engine producing 190hp, how can it be using RON 92?

So I asked him if the manual used RON rating from the USA system or from the European system? He said he wasn't sure.

So if u use the formula mentioned below our Malaysian RON 97 is actually USA RON 92.

So when certain Malaysian websites published all the RON ratings for all cars, I wonder which RON system did they use.

[matkamil]

What prompted me to find out is bcs I have a colleague who downloaded the manual for his Toyota Celica (7th Gen) from a website in USA and in the manual it told him that RON 92 was ok for his Celica.

But Toyota Celica (7th Gen) engine is a high compression engine producing 190hp, how can it be using RON 92?

So I asked him if the manual used RON rating from the USA system or from the European system? He said he wasn't sure.

So if u use the formula mentioned below our Malaysian RON 97 is actually USA RON 92.

So when certain Malaysian websites published all the RON ratings for all cars, I wonder which RON system did they use.

RON is RON, MON is MON, AKI = (RON + MON)/2. The rule of thumb is RON is 4 to 5 points higher than AKI. AKI is the same as Road Octane Number (RdON) and the same as Pump Octane Number (PON).

[vr2turbo]

RON is RON, MON is MON, AKI = (RON + MON)/2. The rule of thumb is RON is 4 to 5 points higher than AKI. AKI is the same as Road Octane Number (RdON) and the same as Pump Octane Number (PON).

Oh brother, now more confused.....ha! ha!

Bro. Pc,

But US uses AKI right? not RON.......

[PcPhobic]

Oh brother, now more confused.....ha! ha!

Bro. Pc,

But US uses AKI right? not RON.......

I know. It's just that in some manual, it doesn't state AKI or RON. It just says Octane rating of XX.

[vr2turbo]

I know. It's just that in some manual, it doesn't state AKI or RON. It just says Octane rating of XX.

Ok, Ok, understand now. Thanks for the info......

[fandango]

"The people whom have to worry about low octane rating are our friends out west in places like California that are subjected to substandard 91 octane.
91 AKI Octane (US measure) = 95.5 RON Octane"

aiyoyo, that means our govt is selling us substandard stuff man...crap...

[vr2turbo]

"The people whom have to worry about low octane rating are our friends out west in places like California that are subjected to substandard 91 octane.
91 AKI Octane (US measure) = 95.5 RON Octane"

aiyoyo, that means our govt is selling us substandard stuff man...crap...

Have you read the RON 95 topics??