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What kind of gas do you put in a 2003 Ford F-250 super duty V10 6.8 liter?

The 2003 Ford F-250 Super Duty with the 6.8L V10 engine requires unleaded gasoline. Specifically, it's recommended to use regular unleaded gasoline (87 octane or higher). While it *can* run on higher octane fuel, there's no performance benefit to using anything above 87 octane with this engine.