CITROËN DS 4 Handbook page 58

A few definitions...
Range
(miles or km)
The distance which can still be travelled with
the fuel remaining in the tank (at the average
fuel consumption seen over the last few miles
(kilometres) travelled).
This value may vary following a change
in the style of driving or the relief,
resulting in a significant change in the
current fuel consumption.
When the range falls below 20 miles (30 km),
dashes are displayed. After filling with at least
5 litres of fuel, the range is recalculated and is
displayed when it exceeds 60 miles (100 km).
If dashes are displayed continuously
while driving in place of the digits,
contact a CITROËN dealer or a
qualified workshop.
Current fuel consumption
(mpg or l/100 km or km/l)
Calculated over the last few seconds.
This function is only displayed from
20 mph (30 km/h).
Average fuel
consumption
(mpg or l/100 km or km/l)
Calculated since the last trip computer reset.
The fuel consumption of your vehicle
will be higher than the official figures
obtained by CITROËN during the first
1 800 miles (3 000 km) of the vehicle's
life.
Average speed
(mph or km/h)
Calculated since the last trip computer reset.
distance travelled
(miles or km)
Calculated since the last trip computer reset.
Stop & Start time
counter
(minutes / seconds or hours /
minutes)
If your vehicle is fitted with Stop & Start, a time
counter calculates the time spent in STOP
mode during a journey.
It resets to zero every time the ignition is
switched on.