Toyota 2013 Prius Owner's Manual page 297

EV driving ratio indicator
The ratio of the distance driven using only power charged from an
external power source against other driving conditions is displayed
on the EV driving ratio screen. Two separate EV driving ratios can be
used: EV driving ratio (1) and EV driving ratio (2).
Calculation can be started or finished at any time via the reset operation.
Switching the display
■
PRIUS PHV_OM_OM47787U_(U)
2-2. Instrument cluster
Press the "TRIP" button to switch
between the EV driving ratio (1)
screen and the EV driving ratio
(2) screen.
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