GMC 2002 Yukon Denali Owner's Manual page 172

Fuel
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Each press of the FUEL button will change the
display between the fuel remaining range, average
fuel economy, instantaneous fuel economy and a
blank display.
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The average fuel economy can be reset using the
RESET button.
Trip
Each press of the TRIP button will change the
display between personal trip computer, business trip
computer, timer, vehicle history, annual mileage and a
blank display.
Personal Trip Computer and Business
Trip Computer
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Each press of the arrow button will change the
display between turn on/off, trip odometer, fuel used,
average fuel economy and average speed.
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The ON/OFF button will turn the trip computer on
and off. The information on the trip computer only
gets updated when it is turned on. The personal and
business computers are independent, i.e. turning one
of them on does not turn the other off.
2-84
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All information associated with the trip computer
will be reset when the RESET button is pressed.
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If the RESET button is pressed and held for more
than two seconds, all of the trip computer settings
will reset starting from the last ignition cycle
(turning the ignition from OFF to RUN). This
feature is for someone who has forgotten to reset the
trip computer when pulling out of the driveway and
does not realize it until after driving for awhile.
Timer
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Each press of the ON/OFF button will turn the timer
on or off.
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The RESET button will reset the timer to 00:00:00.
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If turned on, the timer will accumulate whenever
the SIC is powered (the engine does not have to
be running).
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The timer will rollover after 99:59:59.