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The 3.2 litre engine runs a 10:1 compression ratio. Higher Octane fuel prevents knocking, detonation, and possible engine damage. Also its worth mentioning that in Europe 91 octane is low grade fuel.
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That being said the engine does have a knock sensor. In the event of engine knocking the ignition timing will be retarded in increments of 2.3 degrees to a max of 15 degrees. This will prevent engine damage that could come from lower grade fuel.
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Here is the catch. As the ignition timing is retarded the engine will produce (slightly) less power at full throttle, and your millage may decrease. (slightly) The car calls for 91 Octane fuel. I would personally use 89 and not loose any sleep, and I would use 87 in a pinch. In the end though the decision is all yours.
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