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fuel specifications

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Cayman; Year: 2008; Engine (type, size, modifications): 2.7; Total Mileage: 2000 miles; Transmission: Manual;

The manual recommends 93 octane. In my area the options are 91 octane, or 94 which "may contain 10% ethanol". The car seems to run well on either but, when I can get Chevron 94 (in British Columbia)with no ethanol, it runs even better and gets better mileage. Which of the first two do you recommend?

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