Ford 1996 Windstar Manual page 103

Warning Lights and Gauges
Your distance to empty may change faster or slower than actual
distance traveled because your fuel economy varies with
changing driving conditions.
The fuel computer will automatically warn you when your
distance to empty is low. When your distance to empty reaches
50 miles (80 km), 25 miles (40 km) and 10 miles (20 km), the
fuel computer will automatically select DISTANCE TO EMPTY,
flash the number for five seconds, and sound a one second
chime.
If the Distance to Empty function displays CO or CS, you must
have the fuel indication system serviced.
Turn your ignition to OFF while fueling to obtain an accurate
distance to empty reading. If you do not turn your ignition off,
the fuel computer will not display the new distance to empty
immediately, but will slowly increase to the correct value.
AVERAGE SPEED
Your average speed is the average speed your vehicle has
traveled while the ignition was ON since the last reset. To
display your average speed, press SELECT until the pointer is at
AVERAGE SPEED. Press the RESET button when AVERAGE
SPEED is selected to reset the average speed. You may want to
use this feature to see what your average speed is during daily
driving or on a long trip.
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