Fuel octane question

[Jason Haines]

If I recall correctly, your 97 or 98 RON fuel is equivalent to a US 94/95
octane fuel (slightly higher octane than the normally available premium fuel
in the US which is 93 to 94 octane by the (MON+RON)/2 method). Some OE
manufacturers claim slightly higher power outputs for boosted engines in
Europe and attribute it to the higher octane fuel available (as Toyota did
with the Supra twin turbo).


Jason

>
> Question from the UK. Over here our petrol station pumps indicate octane
> by law. We measure using the RON octane method and number. In the USA
> they use MON + RON divided by 2. As near as is practical how would the
> US see our Super Unleaded pump fuel, advertised as 97 RON?
>
> I am building a Mazda rotary turbo and want to know how the US would
> "see" the octane of our 97 RON Super Unleaded to see if the engine is
> viable on our best street pump fuel, all octane references I can find
> and trust are from the US.
>
> Thanks.
>
> --
> Best regards,
>            Chris Wilson
mailto:chris at formula3.freeserve.co.uk
>                                      http://www.formula3.freeserve.co.uk
>
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