Cadillac DeVille 2005 Owner's Manual page 176

Fuel Data Display
(Digital Cluster Only)
The average fuel economy (AVG) display shows the
average miles per U.S. gallon.
3-56
The fuel data display tells
you all you about the fuel
economy and how far
you can travel with the
fuel remaining.
To reset the average fuel economy, press the INFO
button until the MPG AVG is displayed on the DIC.
Press and hold the INFO RESET button until both the
fuel data display and DIC display reads 0.0.
The RANGE display shows how far the computer thinks
you can travel with the fuel that is in the tank. The
computer does not know what driving conditions will be
like for the rest of your trip, so the range is estimated
based on the recent fuel economy. Therefore, the range
reading may change as your driving habits change.
Going from city to highway driving may increase
the range reading.
On the analog cluster, fuel data can be obtained by
pressing the INFO button. See Driver Information
Center (DIC) on page 3-57.