Toyota PRIUS Manual page 86

1-1. Plug-in hybrid system
 Luggage
Carrying heavy luggage can require excessive energy. Avoid
leaving unnecessary luggage in the vehicle.
Also, equipping a large roof rack can cause excessive energy
consumption in the same way as carrying heavy luggage.
 Warming up before driving
Since the gasoline engine starts up and cuts out automatically,
warming up is not necessary.
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PRIUS PHV_OM_OM47831E_(EE)