Prius User-Guide (2010-2012)
Efficiency
Having immediate feedback about the results of system operation as it happens is quite empowering. You develop an appreciation for
how the design responds to the complexities of real-world driving conditions. It influences your choices about driving. The following
are examples of what you’ll find most informative.
Whether or not your Prius has a plug, you’ll often drive in “Stealth” mode. This is when the gas
engine shuts off (stops moving) and travel continues along using only the electric motor, even
though you are not driving in EV mode. That “EV” symbol indicates that status. This automatic
feature of the hybrid system takes advantage of efficiency opportunities. There’s nothing you need
to do to optimize it. In fact, prolonging the engine from starting back up again may lower overall
MPG. It’s there as a reminder of how Prius efficiency is achieved.
Distance of travel has always been an efficiency influence easily overlooked. The introduction of
the ability to use plug-supplied electricity makes the topic even more eluding. On the Eco-Meter
and Consumption screens, you’ll see TRIP-A and TRIP-B values for MILES and MPG. When trips
are really short or really long, you’ll notice a significant efficiency different from trips medium in
length. Don’t let that bother you. Remember, you’re still getting a benefit from the electricity
regardless of how it’s used. That MPG value clearly shows it.
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