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What are the reasons for increased car fuel consumption?

2 Answers

NoraLynn

07/29/25 12:59am

Possible reasons include low tire pressure, spark plug carbon buildup, or improper lubrication. Below is relevant information about car fuel consumption: 1. Concept of car fuel consumption: Fuel consumption refers to the fuel economy indicator when a car is traveling at a constant speed on good road conditions. Since constant-speed driving is a basic operating condition for cars on highways, and this type of fuel consumption is easy to measure, it is widely used. 2. Calculation of car fuel consumption: On a specialized test track under specified conditions of humidity, air pressure, and tire pressure, with full load and constant speed (weighed with passengers and trunk loaded with weights), specialized measuring instruments (such as graduated measuring cups and flow meters) are used to cut off the vehicle's original fuel supply system. The fuel in the measuring cup is used to drive the car for several tens or hundreds of meters (excluding fuel consumption during acceleration and without coasting). The round-trip fuel consumption is then divided by two to calculate data such as the constant-speed fuel consumption per 100 kilometers.

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JanelleLee

08/12/25 5:10am

I've been driving for decades, and recently my fuel consumption suddenly skyrocketed from 7 liters per 100 kilometers to 11 liters. This made me thoroughly inspect my car: the tire pressure showed only 2.0 bar, significantly lower than the normal 2.4 bar, and the deflated tires increased rolling resistance; the air filter was completely clogged with dust, and it improved a lot after replacing it with a new one; I also reflected on my driving habits—frequent rapid acceleration and hard braking made the engine burn more fuel. Furthermore, the engine oil hadn't been changed for too long, becoming sticky and adding extra burden; the spark plugs had some carbon buildup, and cleaning them helped a bit. If you pay attention to regular maintenance, such as checking tire pressure monthly, replacing the air filter every six months, and driving more steadily, fuel consumption will naturally stabilize. Never ignore small issues that can accumulate into big problems.

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