Oldsmobile 1999 Aurora - Manual (Page 135)

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Fuel
Press FUEL to see how much fuel has been used since
you last pressed the RESET button. The display will
show a reading such as:
10.4 GALLONS USED or 39.4 LITERS USED
To learn how much fuel will be used from a specific
starting point, first press FUEL to display fuel used,
then press RESET.
Don’t confuse fuel used with the amount of fuel in
your tank.
Fuel Range
RANGE calculates 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 a
reading such as:
FUEL RANGE 235 MI or FUEL RANGE 378 KM
If the range is less than 50 miles (80 km), the display
will read LOW FUEL RANGE.
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.
Resetting fuel range causes the fuel economy data to be
updated immediately. To reset fuel range, press
RANGE, then RESET.
Average Speed
The calculation for average speed begins when SPEED
is reset. Press SPEED to display the average speed,
such as:
AVG SPEED 55 MPH or AVG SPEED 90 KM/H
To reset the average speed, press SPEED and
then RESET.