Dodge 2009 Ram 3500 - Manual (Page 150)

Global Reset
If the RESET button is pressed twice within two seconds
while in any of the four displays (AVG, ECO, ODO, ET),
the Global Reset will reset all four displays.
Step Button
Use this button to choose or cycle through the four trip
conditions.
Average Fuel Economy (AVG ECO)
Shows the average fuel economy since the last reset.
Average fuel economy is a running average of the
amount of fuel used and the distance the vehicle has
traveled.
STEP Button
148 UNDERSTANDING THE FEATURES OF YOUR VEHICLE