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No vehicle gets its best mileage after a cold start.
However, hybrids are particularly affected because they will not activate some of the fuel-saving hybrid functions (like automatically stopping the engine while coasting/stopped, or enabling EV mode at low speeds) until the engine coolant is up to a certain temperature.
The solution (whether hybrid or not) is to add a plug-in coolant heater (block heater), partial to full grille blocks, and a belly pan. Some people even add fire-proof insulation in the engine bay. Thermal management!
I'm sure other Prius/hybrid owners will chime in.
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