Trip Odometer; Electronic Road-Speed Governor - GMC 2003 Savana Owner's Manual

Speedometer
Your speedometer lets you see your speed in both
miles per hour (mph) and kilometers per hour (km/h).
Your odometer shows how far your vehicle has
been driven, in either miles (used in the United States)
or kilometers (used in Canada).
You may wonder what happens if your vehicle needs a
new odometer installed. Laws vary as to the procedure
that must be followed, so check with your state or
provincial vehicle registration office. But generally, if the
new odometer can be set to the mileage total of the
old odometer, then it must be. But if it can't, then it's set
at zero, and a label must be put on the driver's door
to show the old mileage reading when the new odometer
was installed.
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Trip Odometer

To reset the trip odometer, fully press the reset button
located near the trip odometer readout.
The trip odometer can show either total miles or trip
miles using this button located on the instrument cluster.

Electronic Road-Speed Governor

Your vehicle may have this feature. This system
automatically controls top vehicle speed. The system
controller receives a signal from the vehicle speed sensor
and reduces power when the vehicle speed reaches the
maximum 65 mph (105 km/h) governed speed.
The trip odometer can tell
you how far your vehicle
has been driven since
you last set the trip
odometer to zero.