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Hi,
Don't make the mistake of equating Octane with Power. High Octane Gasoline does not necessarilty have any more power, in fact, depending on the Octane Boosting Agent used, it could actually have less Power. Adding Ethanol to Gasoline will boost the Octane Properties and Rating, but Ethanol contains about 8% less energy than gasoline, so a Tankful containing 10% Ethanol will actually contain less energy than a tankful of non-Ethanol laced Gasoline.
Octane Rating is a measure of the Fuel's resistance to compression related Spontaneous Combustion. Using it may allow your engine to extract more Power from the Fuel it uses, but the Fuel doesn't contain any more Power.
As stated, it's useless to use Fuels with a Higher Octane Rating than spec'd by the Manufacturer. The Boxster is spec'd at 93 Octane, but can go as low as 90 Octane, the ECU (DME in Porsche Parlance) will compensate, but power will be slightly diminished by the retarding of the spark. Hope this helps...
Happy Motoring!... Jim'99
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