What is the relationship between car displacement and fuel consumption?
2 Answers
Generally speaking, the larger the displacement, the higher the fuel consumption per 100 kilometers. However, there is no fixed calculation formula between the two, and it can also be affected by the driver's driving habits. Here is the relevant introduction: 1. Fuel consumption reference: Displacement, curb weight, full load weight, actual engine operating conditions (speed, output torque), and road conditions can be reflected through the engine's real-time parameters. There are many other factors, such as air resistance (which has a significant impact at high speeds), tires, etc. But apart from human driving factors, the most difficult to quantify is the assembly process, which is a key factor in testing a manufacturer's comprehensive strength. 2. Fuel consumption: Fuel consumption is directly proportional to the vehicle's own weight. To ensure stability and comfort, high-end luxury cars with large displacements increase their own equipment weight to enhance stability, resulting in increased rolling resistance and consequently higher fuel consumption.
I think the relationship between car engine displacement and fuel consumption is quite intuitive. Generally, larger displacement engines consume more fuel because displacement refers to the total volume of the engine's cylinders, measured in liters. A larger displacement means more fuel is needed for each ignition to generate power, so you'll find yourself refueling more frequently in daily driving. However, this isn't absolute—other factors like vehicle weight, aerodynamic design, and transmission type also play a role. For example, an SUV with a large displacement but heavy weight may have double the fuel consumption, while a sedan with a slightly larger displacement might be more fuel-efficient. Technological advancements, such as turbocharging, allow small 1.0-liter engines to output power comparable to larger 2.0-liter engines while consuming less fuel. Having driven various cars and done actual calculations, I've found that a 1.5-liter car consumes about 6-7 liters per 100 kilometers, while a 2.0-liter might reach 8-10 liters, with an even bigger difference in city traffic jams. When choosing a car, don’t just focus on displacement—consider the overall efficient engine design and driving habits, such as smooth driving, which can save a lot of fuel.
