Toyota PRIUS Manual page 48

1-1. Plug-in hybrid system
 When in EV mode
Driving using only the electric motor (traction motor) is possible
(excluding certain situations, such as when accelerating sud-
denly), but if the amount of charge remaining in the hybrid bat-
tery (traction battery) becomes low, EV mode will be canceled.
In order to prolong EV mode driving, observe the following:
 Check the EV driving range using the energy monitor or
Hybrid System Indicator.
 Avoid sudden acceleration and sudden deceleration, and be
sure to drive smoothly.
If you repeatedly accelerate, the hybrid battery (traction bat-
tery) charge will deplete quickly. Also, the gasoline engine will
start, depending on acceleration or the vehicle speed.
 Restrain your speed as much as possible. The EV driving
range will reduce considerably at high speeds.
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