Toyota PRIUS 2014 Manual page 71

1-1. Plug-in hybrid system
The estimated EV driving range may change significantly with
each charging until the electricity consumption based on the
recorded value is stable (for approximately the first month or
two). However, this does not indicate a malfunction.
1
When the air conditioning system is turned on, the estimated EV
driving range is calculated to be approximately 10% shorter
compared to when the air conditioning system is off in consider-
ation for an increase in electricity consumption.
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PRIUS PHV_OM_OM47856U_(U)