Q: Can my 1999 town car use 89 octane even though it says 91

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Can my car use 89 octane even though it says 91 on gas cap

My car has 110000 miles.
My car has an automatic transmission.

If your vehicle says premium fuel only on the gas gauge then you should use only the premium fuel. In a pinch you can run the 89 octane fuel and try not to do any heavy acceleration to avoid engine pinging or pre-ignition. The pre-ignition can cause internal piston damage if excessive.

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