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Fuel Octane

Engine

Vehicle Information: Year: 1982; Body Type: Coupe;

I use Shell 93 octane fuel in my 82 SC based on my former mechanic's reccomendation (he moved to NC). I read the manual and beleive that a lower octane might be indicated. What should be used? I drive on the street only and rarely exceed 80 mph, although I get there rather quickly. The car has 81,500 miles and received a full tune up about 7k miles ago. It gets 23.5 mpg at 80 mph on highway with air on. I not wanting to be cheap, but is 93 octane needed? What should be used?

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