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ETS and high octane gasoline S70

My ETS light has been coming on regularly and I understand that I'll need a new control unit in the near future. My question is this: Is there any connection between using high octane fuel (93 Octane) and the throttle body? The reason I ask this question is, it seems that when I use the higher octane fuel, the ETS light stays off and the car runs smoother than when I use regular gasoline. Is this just a conincidence or is there a connection?






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