It is different if there is a defect as the cause of increased fuel consumption. The search can be very difficult. Incidentally, it is not possible to determine from when a defect is actually responsible for increased fuel consumption based on the level of additional consumption. The consumption can deviate by only a few percent and is therefore hardly noticeable, but it can also be twice as high as usual. It usually becomes noticeable when nothing changes in the usual parameters. The same route, the same volume of traffic, the same driver and the same driving style – and yet consumption increases. If that is the case, you should get to the bottom of the cause.
Calculate fuel consumption: the formula
How to measure your car’s fuel consumption:
• Fill the vehicle up to the brim. A little patience is required. By shaking the car, the last air bubbles escape and the tank is really full to the brim.
• Then “zero” the trip meter and drive the vehicle as usual. The route should not be too short (at least 100 kilometers).
• To calculate the consumption, the amount of fuel consumed in liters is multiplied by 100 and divided by the kilometers driven. The result is the average consumption per 100 kilometers.
• Example: 38.27 liters x 100 : 523 kilometers = 7.32 liters per 100 km
You can check that yourself
Mechanical causes for increased fuel consumption
In general, every bearing that is responsible for the freewheeling of engine and transmission shafts can contribute to increased consumption due to increased resistance. However, if the resistance is so strong that it has a noticeable effect on consumption, the defect has usually already been announced by a significantly changed background noise (grinding and grinding noises, depending on the gear selection and speed).