McLaren P1 Owner's Handbook Manual page 73

DRIVING CONTROLS
HANDLING AND POWERTRAIN CONTROLS
Economy Mode
When the vehicle is operating in any
powertrain setting with automatic gear shifts
selected, the transmission adapts to an
economical shift strategy during periods of
gentle driving. This is determined by the
vehicle speed, acceleration, braking and road
gradient.
Depending on the current active shift
strategy, the word 'NORMAL', 'SPORT' or
'TRACK' changes colour for Powertrain.
For information on other ways to save fuel,
see Economical Driving, page 2.14.
2.29