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Making another post about octane since it's a different matter entirely. I think you might be referring to 100 RON fuel, which is a different standard than we have in the states. As I understand it, 100 RON is equivalent to 87 ish here.
Octane is, in basic terms, the knock resistance of the fuel. Gasoline still burns at the same ratio to air regardless of knock resistance. Therefore it should not affect fuel trims.
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