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You won't notice a difference. Depending on where I am, I've used 91 at Petro and 94 at Shell and never noticed a diff in terms of mileage or performance. So I typically go with the 91 as there is no ROI on the higher priced gas.
Lots of things to sweat about with these...gas is not one of them.
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2011 Boxster 987.2 Arctic silver / Black leather, PDK with Sports Chrono Package Plus
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