GMC Chevrolet Tahoe 2003 Manual page 221

Fuel Information Button
Use the fuel information button to scroll through the
range, average fuel economy, instant fuel economy and
the GM Oil Life System™.
If your vehicle is not equipped with the DIC steering
wheel control buttons you will not be able to display the
fuel information.
Fuel Range
Press the fuel information button until RANGE appears
to display the remaining distance you can drive
without refueling. It's based on fuel economy and the
fuel remaining in the tank. The display will show LOW if
the fuel level is low.
The fuel economy data used to determine fuel range is
an average of recent driving conditions. As your
driving conditions change, this data is gradually updated.
Fuel range cannot be reset.
Average Fuel Economy
Press the fuel information button until AVG appears in
the display. Average fuel economy is how many
miles per gallon your vehicle is getting based on current
and past driving conditions.
Press and hold the select button while AVG.ECON is
displayed to reset the average fuel economy. Average
fuel economy will then be calculated starting from
that point. If the average fuel economy is not reset, it
will be continually updated each time you drive.
Instant Fuel Economy
Press the fuel information button until INST appears in
the display. Instant fuel economy is how many miles
per gallon your vehicle is at the particular moment
in time. The instant fuel economy cannot be reset.
GM Oil Life System™
Press the fuel information button until ENGINE OIL LIFE
appears in the display. The GM Oil Life System™
shows an estimate of the oil's remaining useful life.
It will show 100% when the system is reset after an oil
change. It will alert you to change your oil on a
schedule consistent with your driving conditions.
Always reset the engine oil life after and oil change.
To reset the Oil Life System press and hold the select
button while ENGINE OIL LIFE is displayed. OIL
LIFE RESET will appear on the display for 10 seconds
to let you know the system is reset.
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