I’m soon to get a 987.1 cayman 2.7L, and I’m wondering if the car would be more fuel efficient if I use 93 or 91. The previous owner always used 93, so would there be an issue if I tried using 91?
Is the power difference noticeable at all?There's no difference in fuel economy between any of the differrnt octane fuels. There is, however, a difference In maximum power available if the engine is tuned to take advantage of the higher octane.
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Definitely never going lower than 91. What do you use?Agree, I have a 987.1 cayman 2.7L. The owner's manual recommends 93 but says anything over 90 is ok. The ECU will adjust and the power difference because of that will be negligible. That said, I wouldn't drop to mid-grade or regular.
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I am lucky to have access to a performance gas station here in Oregon that sells up to 97 octane. It's not cheap though! Close to $4/gallon. So, I use it at the end of the year before I store my Porsche for the winter.too bad we don't have that choice here in CA, stuck with 91
My experience with our Audi and Cayman S is similar. Both cars give better fuel mileage when using premium than when using mid-range fuel, which in Washington State is usually 89 octane. Better fuel mileage means the engines are operating more efficiently on premium. Because of this, I stick with the manufacturers' recommendations and no longer put anything but premium in them.I found that mileage varied measurably with octane - higher octane, greater mileage, as much as 10% lower mileage with lower octane.