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What does the fuel reset button do on a 2004 expedition?

The "fuel reset" button on a 2004 Ford Expedition doesn't actually reset the fuel *in* the tank. Instead, it resets the trip odometer that's tied to fuel economy calculations. This allows you to track your fuel mileage over a specific driving period, like a trip or a tank of gas. After pressing it, the computer starts calculating your fuel economy from zero again.