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Anyone know the difference between the US and UK ron rating equations?

I've started using V-max over, but its specified at 93! Standard unlead is rated at 87. Still a US gallon of V-max is only $2.20.
 

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As far as I recall int the US, they use (RON+MON)/2

An explanation of RON and MON ratings can be found here

So 93 is going to be about 97 RON.

94 is about the best I've seen over there but I have been told that some garages will sell 100 :D

Cheers,

Simon
 
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