GMC 2001 Envoy - Manual (Page 135)

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Variance is the difference between magnetic north and
geographic north. In some areas, the difference between
the two can be great enough to cause false compass
readings. If this happens, follow these instructions to
set the variance for your particular location:
1. Find your location on the zone map earlier in this
section. Record your zone number.
2. Press and hold both the MODE and the US/MET
buttons in the COMP/TEMP mode.
3. After five seconds, the compass will acknowledge
the variation mode by displaying the current zone
number. When it does, release both buttons.
4. Press US/MET until your zone number appears
on the display.
5. Press MODE to enter your zone number.
Your variance is now set and the display will
return to the COMP/TEMP mode.
TRIP: Once in the TRIP mode, pressing the
MODE button will step you through the following
TRIP functions:
D AVG ECON: The average fuel economy since the
last reset is displayed.
D INST ECON: Instantaneous fuel economy for the
last second of driving is displayed.
D RANGE: The display indicates the estimated
distance that can be travelled with the remaining fuel
in the tank, based on the fuel economy for the last
few hours of driving.
D FUEL USED: The fuel used since the last reset
is displayed.
D AVG SPEED: The average speed since the last
reset is displayed.
To reset the trip computer, press the MODE and
US/MET buttons simultaneously for at least two seconds.
All functions will be displayed for half a second once the
system is reset. Reset can only be performed in the
AVG ECON, FUEL USED and AVG SPEED modes.
All three modes are reset simultaneously.