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thu187
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Location:
Sydney
Registered:
September 2004

Re: Toyota Camry Supercharger TS-01 Concept

Sat, 12 March 2005 17:51

CamryMan wrote on Sat, 12 March 2005 22:51

the US has crappier fuel than in Oz would you believe ( I think their premium is 91 RON, ours is now 98).

That's not correct. Firstly their premium is 93, not 91. Secondly their's is measured differently.

We measure ours in straight RON (Research Octane Number) which is a measurement of how resistant petrol is to premature detonation (knocking).
The other measurement is MON (Motor Octane Number) which is a better measurement of how the fuel behaves when under load. The MON of modern petrol is generally about 10 points lower than the RON.

In Australia and Europe we take just the RON (Research Octane Number).
In the USA they take the average of the RON and MON to create another measurement called RON as well but it stands for Road Octane Number instead of Research Octane Number. MON is 10 points lower than our RON so if you take the average of MON and Research Octane Number, the Road Octane Number will be 5 points lower.

Thus 93 + 5 = 98.
It's a bit confusing, using the same acronym but there ya go! Smile

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