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Originally Posted by M3UOND
If you were running 95, then my guess is that you're in the UK or Europe? If so, then no, 91 is no good.
To explain to USAers: we have RON+MON/2 here. They don't, and their higher nominal ratings are due principally to a difference in calculation.
That said, their gasoline is still superior to ours--they generally have a much better additives package.
Originally Posted by PhatCat
Wow, we must be way off the back. We have 87/89/91 in most cases here...
Why might that be?
Originally Posted by drz
Have you not been reading? They are two different systems. You, in Canada, have the same system as we do in the US. In Europe and Australia, RON octanage is displayed at the pums. Here in the US/Canada (maybe even the rest of the Americas), we use AKI (anti-kncok index) = (RON+MON)/2
As a general rule of thumb, RON-4 =~ AKI.
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