GMC Cadillac CTS 2004 Owner's Manual page 184

To reset the MPG AVG using the Base audio system,
press the CLR button located to the right of the screen.
The display will return to zero.
To reset the Average Fuel Economy using the Navigation
system, press and hold the multifunction button that
corresponds to the Reset prompt in the upper right of the
display. The display will return to zero.
MPG INST/Instantaneous Fuel Economy: If you
select this item, the current fuel economy is displayed.
This number reflects only the fuel economy that the
vehicle has right now and will change frequently
as driving conditions change. Unlike average fuel
economy, this menu item cannot be reset.
GAL FUEL USED/Fuel Used: If you select this item,
the number of gallons or liters of fuel used since the last
reset of this menu item is displayed.
To reset GAL FUEL USED using the Base audio
system, press the CLR button located to the right of the
screen. The display will return to zero.
To reset Fuel Used using the Navigation system, press
and hold the multifunction button that corresponds to
the Reset prompt in the upper right of the display.
The display will return to zero.
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MILES RANGE/Fuel Range: If you select this item, the
approximate number of remaining miles or kilometers
you can drive without refueling is displayed. This
estimate is based on the current driving conditions and
will change if the driving conditions change. For
example, if you are driving in traffic making frequent
stops, the display may read one number, but if you enter
the freeway, the number may change even though
you still have the same amount of gas in the gas 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 Low Fuel Level
message will be displayed. See "Low Fuel Level
Message" under DIC Warnings and Messages on
page 3-70 for more information.
AVG MPH/Average Vehicle Speed: If you select this
item, the average speed of the vehicle is displayed 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 menu item.
To reset AVG MPH using the Base audio system, press
the CLR button located to the right of the screen.
The display will return to zero.