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Stock L-jet Spiders (82-89) are designed to run on "regular" octane gasoline. Some of the confusion about what octane to use stems from the fact that in Europe they use a slightly different method of rating gasoline's octane. 91 octane in Europe (RON) is equivilant to 87 octane in the USA (PON).
The computer in our Spiders cannot adjust for octane.
Using a higher octane than required is a waste of money. You will not get more power or better mileage. (cars that DO have the capability to adjust ignition timing based on engine knock/pinging MAY benefit from higher octane IF the computer advances the timing with the use of higher octane fuel)
From the 1984 Spider Owner's Manual:
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