Toyota 2012 Prius C Owner's Manual page 217

2-2. Instrument cluster
■
"ECO savings" settings
The gasoline price and fuel consumption comparison settings can be
set, and the screen settings can be changed between basic and
detailed.
● To input the gasoline price, press the "DISP" (to increase) or
"TRIP" (to reduce) switch.
When the engine switch is turned to the "ON" position (vehicles without a
smart key system) or the "POWER" switch is turned to ON mode (vehicles
with a smart key system) after refueling, the gasoline price input screen is
automatically displayed.
● To input the fuel consumption comparison, press the "DISP" (to
increase) or "TRIP" (to reduce) switch.
When the fuel consumption comparison is input, the estimated savings in
fuel costs are displayed. If the fuel consumption comparison is not input,
the cost of the consumed fuel will be displayed.
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