Lexus 2003 LS Owner's Manual page 70

GAUGES, METERS AND SERVICE REMINDER INDICATORS
The multi–information display shows "–.– MPG" for a while
after refueling or pushing the "RESET" switch, and then shows
the previous average fuel consumption until you start the
vehicle.
A Driving distance after refueling
The driving distance after refueling is displayed.
When refueling, be sure to stop your vehicle and turn the
ignition switch off.
The driving distance after refueling could not be calculated in
either of the following cases:
A Refueled by opening the fuel filler door using the manual
lever in the trunk
A Refueled with a small quantity of gasoline
To begin recalculating, push the "RESET" button for about 1 to
2 seconds.
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13L136
A Elapsed time
W31 W31
The total time that the engine has been running is
displayed.
When the engine is started again after the ignition is off, the
driving time is added to the previous value. Up to 99 hours 59
minutes can be displayed. When the driving time exceeds 99
hours 59 minutes, the display returns to 0 and recounting
starts.
To begin recalculating, push the "RESET" button for about 1 to
2 seconds.
A Average vehicle speed
13L137a
The average vehicle speed is calculated and displayed
based on the total driving distance and the total driving
time with the engine running.
The displayed value is updated every 10 seconds.
To begin recalculating, push the "RESET" button for about 1 to
2 seconds.