Chevrolet 2010 Impala Owner's Manual page 185

If the retro-active reset feature is activated after
the vehicle is started, but before it begins moving,
the display will show the number of miles (mi) or
kilometers (km) that were driven during the last ignition
cycle.
Press the trip/fuel button until FUEL RANGE displays.
This display shows the approximate number of
remaining miles (mi) or kilometers (km) the vehicle
can be driven without refueling.
The fuel range estimate is based on an average of
the vehicle's fuel economy over recent driving history
and the amount of fuel remaining in the fuel tank.
This estimate will change if driving conditions change.
For example, if driving in traffic and making frequent
stops, this display may read one number, but if the
vehicle is driven on a freeway, the number may change
even though the same amount of fuel is in the fuel tank.
This is because different driving conditions produce
different fuel economies. Generally, freeway driving
produces better fuel economy than city driving.
If your vehicle is low on fuel, the FUEL LEVEL LOW
message displays. See FUEL LEVEL LOW under
information.
Press the trip/fuel button until AVG ECONOMY
displays. This display shows the approximate average
miles per gallon (mpg) or liters per 100 kilometers
(L/100 km). This number is calculated based on the
number of mpg (L/100 km) recorded since the last time
this menu item was reset. To reset this display to zero,
press and hold the set/reset button.
Press the trip/fuel button until INST ECONOMY
displays. This display shows the current fuel economy
at a particular moment and will change frequently as
driving conditions change. This display shows the
instantaneous fuel economy in miles per gallon (mpg)
or liters per 100 kilometers (L/100 km). Unlike average
economy, this screen cannot be reset.
Press the trip/fuel button until AVERAGE SPEED
displays. This display shows the average speed of the
vehicle in miles per hour (mph) or kilometers per hour
(km/h). This average is calculated based on the various
vehicle speeds recorded since the last reset of this
for more value. To reset the value, press and hold the set/reset
button. The display will return to zero.
This display shows no information.
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