Ford Mercury Villager 1997 Owner's Manual page 32

To display the average fuel economy:
1. Press the SELECT button until the menu displays AVG
ECONOMY.
2. You will probably display the average fuel economy for each
tank of fuel or for each trip you take. Each time you want to
recalculate the average fuel economy, you need to press the
RESET button. The average fuel economy must be displayed
to reset the fuel computer.
The best time to reset the AVG ECONOMY is when you fill
the fuel tank or at the beginning of a trip.
TO EMPTY
The Distance to Empty function tells you approximately how
many miles or kilometers you can drive until you run out of fuel.
To see the Distance to Empty, press the SELECT button until
the menu displays TO EMPTY. The fuel computer displays
approximate distance to empty until you select another function.
To ensure accuracy, turn the ignition to the OFF position
when you fill the fuel tank.
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