The simplest method is full tank to full tank. Fill the tank and record the odometer. At the next fill-up, take the liters added and the distance driven. Divide liters by kilometers and multiply by 100.
Example: you drove 700 km and added 245 liters at the next fill-up. The math: 245 divided by 700 times 100 equals 35 liters per 100 km. One measurement is not enough. Average at least several trips. Fill the tank to the same level every time.
A full tank is not always possible. In that case, use a multi-fill method. First fill the tank and record the reading. During the trip, log each fill-up in liters and kilometers. At the end, fill the tank again and divide total liters by total distance. That way, partial fill-ups are counted.
Cargo weight directly affects consumption. A loaded truck burns more than an empty one. Air resistance grows quickly with speed, so high speed raises consumption. Mountain and hilly roads use more fuel than flat ones.
Low tire pressure raises rolling resistance. In cold weather, the engine takes longer to warm up and consumption rises. An idling engine also burns fuel. Switching the engine off during long waits saves fuel.
Consumption changes with the season. In winter, the engine warms up longer, tires are stiffer, and the air is denser. As a result, consumption can be higher than in summer. Watch the seasonal gap in your own log and keep two separate averages: summer and winter. That gives a sounder base for planning and cost calculation.
The consumption stated by the manufacturer is measured under test conditions. Real work is different: load, road, weather, and driver style all vary. So real consumption normally differs from the rated figure. Use your own truck's average as the baseline.
A sharp rise in consumption can signal a fault. A clogged air filter, an injector problem, or low tire pressure are common causes. Watch the gap against your earlier average. Catching a problem early prevents a major repair.
Keep a separate log for each truck. Record the date, distance, liters added, and consumption. A simple spreadsheet is enough. Compare monthly averages between trucks.
A telematics system records consumption automatically and splits it by driver. That is more accurate than manual entry. Reconcile fuel purchase records with bank or fuel card data. If you analyze consumption alongside service history, the cause of a rise is easier to find. For maintenance, contact faw.uz/en/services/.
The first mistake is filling the tank to a different level each time. The result is an inaccurate calculation. Fill to the same mark and calculate from full tank to full tank. The second mistake is not recording the odometer. Without distance, consumption cannot be calculated.
The third mistake is drawing a conclusion from one trip. Cargo, road, and weather differ from trip to trip. Average at least ten trips. The fourth mistake is comparing two trucks that carry different loads on different roads. Compare trucks under the same conditions, or the conclusion will be wrong.
If the records show an unexplained gap, look for the cause. The fuel sensor, the liters on the receipt, and the tank capacity should agree. If the gap repeats, run a check: the cause may be a fault, a recording error, or something else. With clear procedures in the fleet, such cases surface quickly.