McLaren P1 Owner's Handbook Manual page 102

INSTRUMENTS
LEFT-HAND SIDE OF DISPLAY
Units
On the Units screen you can set the following
units of measurement.
Distance - select miles or km.
Speed - select mph or kph.
Temperature - select °C or °F.
Pressure - select kPa, Bar or PSI.
Fuel Consumption - select mpg, km/Litre or
Litres/100 km.
3.8
Volume - select UK gallons, US gallons or
litres.
The setting for your vehicle depends on the
country or region where the vehicle was
purchased. The units can be changed
individually at any time.
Press the OK button on the end of the control
stalk to confirm your selections.
NOTE: This feature also sets the units for
the trip computer.
Time and Date
Set the Time before setting the Date.
The time and date are both set manually.
Press the OK button on the end of the control
stalk to confirm your choice.
The time display can be set as 12 hour or
24 hour format, and the date display can
be set as day followed by month or
month followed by day.