Owner's Manual
Page 174
... the fuel used information, press and hold the set /reset button while FUEL USED is displayed. This display shows the approximate average miles per gallon (mpg) or liters per hour (km/h). TIMER Press the trip/fuel button until FUEL USED displays. This display can be counted as long as a timer. This... to be used since the last time this menu item was last reset, not including time the ignition is calculated based on the number of mpg (L/100 km) recorded since the last reset of this menu item. The display will return to zero.
... the fuel used information, press and hold the set /reset button while FUEL USED is displayed. This display shows the approximate average miles per gallon (mpg) or liters per hour (km/h). TIMER Press the trip/fuel button until FUEL USED displays. This display can be counted as long as a timer. This... to be used since the last time this menu item was last reset, not including time the ignition is calculated based on the number of mpg (L/100 km) recorded since the last reset of this menu item. The display will return to zero.