Fuel consumption, function - GF54.50-P-2007GZ

MODEL 164

Fuel consumption "since start" (short-distance memory), function

Average gasoline consumption since start.

Fig 1: Display Of Fuel Consumption - Average Gasoline Consumption Since Start

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fuel consumption "Since reset" (long-distance memory), function

Average gasoline consumption since last reset.

Fig 2: Display Of Fuel Consumption - Average Gasoline Consumption Since Last Reset

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The display screen "as of start" or "as of reset" for the travel time can be activated via the system selection button (S110s3) and scroll forward/back button (S110s1) of the multifunction steering wheel.

Depending on the unit setting (miles/kilometers) and the national variant coding of the instrument cluster (A1) the fuel consumption is displayed in:

Miles per gallon
Liters per 100 kilometers or
Kilometers per liter (only if national variant Japan is coded)

The trip computer calculates the average fuel consumption figures from the mileage traveled and the fuel consumption signal.

The fuel consumption signal uses information on the amount of fuel injected within a specific period.

The instrument cluster receives this data in the following way:

The fuel consumption signal is generated by the ME control unit (N3/10) and sent as a message on the engine compartment CAN.
The mileage traveled is calculated from the four wheel speeds. The signals are sent from the ESP control unit (N47-5) over the engine compartment CAN.

Following a reset it may take up to three kilometers/miles or two minutes before sufficient data is available in order to correctly calculate and display the consumptions. Depending on the unit setting (kilometers/miles) and the national variant coding of the instrument cluster the fuel consumption is displayed in:

litters per 100 kilometers (ECE)
miles per gallon (USA)
kilometers per litter (Japan)

It is quite normal for the "Since Start" display (short-distance memory) and "Since Reset" display (long-distance memory) to show different values, since the two displays are based on different sets of data.

The "since start" display (short-distance memory) reacts much more sensitively to the current driving situation than the "since reset" display (long-distance memory).

Mileage, function

GF54.50-P-2008GZ