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If you use the lower octane the engine will surge and you will plug up your injectors. You really should run a higher octane than 90 if possible as the specs state premium fuel (for Japan) which is something like 98 RON.
Another important consideration is the contaminents in the fuel. Many countries have high rates of sulfur whic is good for lubrication but bad for injectors.
If you can't get what is the engine is designed for try and least run some injector cleaner through every tank or so and monitor the difference.
Jim
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