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Technically yes. In my vehicle - an FX45, it resulted in a significant drop in gas mileage. In addition, the engine had more pinging during hard acceleration, during the first 5 minutes of driving after a cold start, as the engine adjusts to the lower octane rating.

The end result of using a lower octane, it costs me more to go the same distance. So I would not recommend it.

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Q: Can you use 89 octane in an Infiniti fx45?
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