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Since you're in Ca and using the old 91 Octane yes it would make a slight difference. Porsche programmed our cars to compensate for lower octane fuel. It won't be a significant change but I would use a mixture or race/91 octane to have a 93-94 octane mixture.
On turbo cars yes it makes a big difference.
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2008 Boxster S PDE2
02 Boxster S Blk on Blk(Stock for the Wife)
88 turbo S (My Toy) slightly modified
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