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2008 Boxster 2.7 fuel

Fuel System

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Cayman; Year: 2008; Engine (type, size, modifications): 2.7; Total Mileage: 4000; Transmission: Manual;

Manufacturer recommends 93 octane. Where I live the only choices are 91 and, with 10% ethanol, 94. Which do you suggest?

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