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Originally Posted by tranzformer
Should note that the manual states this regarding the fuel:
stuff

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Where are you getting the part about knock? I see this:
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■ Fuel types
Unleaded gasoline (93 AKI [Research Octane Number 98] or higher)
If unleaded gasoline with an octane rating of 93 AKI (98 RON) is not available, unleaded gasoline with an octane rating of 91 AKI (95 RON) may be
used with no detriment to engine durability or driveability.
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Sounds like it's one of those things where you might get some knock with 91 under hot weather and heavy acceleration at low speeds.