Why Do Domestic Cars Have High Fuel Consumption?
2 Answers
Domestic cars have relatively high fuel consumption, mainly due to technological gaps. More details are as follows: Engine fuel supply technology lags behind joint-venture brands: Direct injection technology is more fuel-efficient than multi-point fuel injection. Currently, most domestic cars primarily use single-point fuel injection, multi-point fuel injection, direct injection, and hybrid injection, especially single-point and multi-point fuel injection, which are more common. As a result, fuel consumption is higher. Engine valve control technology falls behind joint-venture manufacturers: Foreign brands dominate valve technology, while domestic brands use it less frequently. Domestic automakers lack well-known valve control technologies, and research in this area is relatively weak.
The issue of high fuel consumption in domestic cars, as I have found through long-term research on engine technology, primarily stems from engine efficiency and overall design. Domestic engines started late, with many using older engine models that have low thermal efficiency, such as insufficient compression ratios or rough cylinder block manufacturing processes, leading to incomplete fuel combustion and wasted fuel. Additionally, poor transmission matching and suboptimal gear-shifting logic cause significant RPM jumps during acceleration, increasing instantaneous fuel consumption. The vehicle body is also relatively heavy, especially in SUV models that use a lot of materials to pursue a sense of spaciousness, resulting in a drag coefficient over 10% higher. Some domestic components have unstable quality, such as fuel pump leaks or sensor malfunctions, which can lead to false readings or excessive fuel consumption. Technological progress takes time to accumulate, and while newer models, such as those with small-displacement turbocharged engines, show significant improvements, their adoption rate remains low.
