CITROËN C3 Handbok page 38

Multifunction screens
Languages
once the "Languages" menu has been
selected, you can change the language used
by the display, by choosing a new language
from the list offered.
Units
once the "Units" menu has been selected,
you can change the units of the following
parameters:
- temperature (°C or °F),
- fuel consumption (l/100 km, mpg or km/l).
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once the fuel consumption units have
been set to mpg, the information in the
instrument panel screen on speed and
distance will also be in mph and miles.
For safety reasons, configuration by the
driver of the multifunction screen must
only be done when stationary.