Ford Focus 2004 Owner's Manual page 24

Controls and features
Instantaneous fuel consumption
Indicates the current fuel
consumption. Frequent sampling
enables the computer to react
instantaneously to changes in
driving conditions but may cause
large display value fluctuations in
some circumstances.
Average fuel consumption
Indicates the average fuel
consumption after the function was
last reset.
Press the reset button at any time
to reset the average fuel
consumption.
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Remaining fuel range
Indicates the approximate distance
the vehicle will travel on the fuel
remaining in the tank. Changes in
driving pattern may cause the value
to vary.
A short audible warning will sound
at the following ranges: 50 miles
(80 km), 25 miles (40 km),
12 miles (20 km), 0 miles (0 km)