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1995 993 premium gas (or not)

Engine

Vehicle Information: Model: 993; Year: 1995; Body Type: Coupe; Total Mileage: 78,000;

I read your answer on the use of premium gas in the October Panorama Tech Q & A. I run 89 octane thinking that if I don't hear any knock and the car runs fine (not at full power as you note in the Oct question) it would be all right and there would not be any damage. I thought that Porsche would have an automatic spark retard that, sensing lower octane, would adjust the engine to the gas. Thanks for any comment on what is probably a well worn topic.

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