Dodge 2009 Ram 1500 - Manual (Page 253)

Average Fuel Economy / Fuel Saver Mode — If
Equipped
Shows the average fuel economy since the last reset.
When the fuel economy is reset, the display will read
“RESET” or show dashes for two seconds. Then, the
history information will be erased, and the averaging will
continue from the last fuel average reading before the
reset.
The FUEL SAVER MODE message will display above the
average fuel economy in the EVIC display. This message
will appear whenever MDS (if equipped) allows the
engine to operate on four cylinders, or if you are driving
in a fuel efficient manner.
This feature allows you to monitor when you are driving
in a fuel efficient manner, and it can be used to modify
driving habits in order to increase fuel economy.
Fuel Saver Mode — On
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UNDERSTANDING YOUR INSTRUMENT PANEL 251