if you look in the color insrtuction book it says minimum 90, at least mine from kings does.
Keep in mind the octane ratings methods are different in other countries....I posted this a while back, but here it is again:
One thing to remember about recommended octane levels coming from other countries is that they have different rating systems. 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 )
90 RON Octane x 0.95 = 85.5 AKI Octane (US measure)
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. I suspect that the recommended 90 Octane rating that you are getting from the Chinese motors is based off of the RON Octane rating and would equate to AKI (or US method) Octane rating of only 85.5
Warner