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1991 964 Cabriolet - Fuel Octane

Engine

Vehicle Information: Model: 964; Year: 1991; Body Type: Cabriolet; Total Mileage: 75K;

I currently use 92 or 93 octane. My search of other questions on this subject leads me to believe that as long as the engine doesn't ping, then the electronics are adjusting the timing properly. As I read responses to earlier questions, one indicated that higher octane, by itself, does not actually increase horsepower. So, if I switched to 89, AND my engine runs without pinging, ect., are there any other concerns?

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