What are the reasons for a sudden increase in diesel car fuel consumption?

[DiFinn]

Diesel car fuel consumption suddenly increases due to low tire pressure, high oil viscosity, prolonged non-replacement of air and fuel filters, and excessive spark plug gap. The following are related explanations: After three months of normal use, tire pressure will decrease to some extent, and insufficient tire pressure will increase fuel consumption. Using oil with higher viscosity will inevitably increase the internal resistance of the engine, slow down the oil flow rate, and ultimately lead to increased fuel consumption. The cleanliness of the filter directly affects the engine's working condition and thus impacts fuel consumption. If the fuel filter is not replaced for a long time, it will send incorrect signals to the engine control unit, also resulting in increased fuel consumption. Prolonged use of spark plugs leads to carbon buildup and an increased gap, which can cause poor ignition performance, reduced engine power, and increased fuel consumption.