Toyota PRIUS Manual page 315

2-2. Instrument cluster
Odometer/trip meter/distance to empty
 Switching the display
The display changes as follows
each time the "TRIP" button is
pressed. Also, if the button is
kept pressed down while the trip
meter is being displayed, the trip
meter will be reset to 0.
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PRIUS PHV_OM_OM47831E_(EE)