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1997 993 Premium Gas vs Regular Gas

Engine

Vehicle Information: Model: 1997 993; Year: 1997; Body Type: Cabriolet; Total Mileage: 58000;

With gas [priced] as high as it is and some stations getting away from premium gasoline, Can we subsitute regular 87 octane gas for the 91 octane we are use to? If so, what harm will it do to the engine?

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