Toyota 2010 Prius Owner's Manual page 196

2-1. Driving procedures
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Possible driving distance when driving in EV-Drive Mode
Possible driving distance when driving in EV-Drive Mode is up to about 1/2
mile (1 km) if driven at a speed of about 25 mph (40 km/h) or less. (Possible
driving distance depends on the hybrid battery [traction battery] level and
driving conditions.)
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Fuel economy
Your Toyota is designed to achieve the best possible fuel economy during
normal driving (using the gasoline engine and electric motor [traction
motor]). Driving in EV-Drive Mode more than necessary may lower fuel
economy.
CAUTION
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While driving
When driving in EV-Drive Mode, pay special attention to the area around the
vehicle. Because there is no engine noise, pedestrians, people riding bicy-
cles or other people and vehicles in the area may not be aware of the vehicle
starting off or approaching them, so take extra care while driving.
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