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What type of gas should be used on a 2004 ford explorer?

A 2004 Ford Explorer can use either regular unleaded gasoline (87 octane) or mid-grade unleaded gasoline (89 octane). The owner's manual will specify the recommended octane rating. While it might run on higher octane fuel, there's no performance benefit and it's a waste of money. Using lower octane fuel than recommended can lead to knocking (pinging), which can damage the engine over time.