Why does a new car consume more fuel during its first refueling?

[Grant]

New cars consume more fuel during their first refueling because fuel consumption is generally higher during the break-in period, which is a normal phenomenon. Typically, after a break-in period of 2,000 kilometers, fuel consumption will relatively decrease. Engine components not yet broken in: The various components inside a new car's engine have not been fully broken in, and the gaps between parts are relatively small, resulting in higher operating resistance compared to a broken-in engine, which leads to increased fuel consumption. Improper driving habits: If you frequently floor the accelerator or brake hard while driving, it will increase the car's fuel consumption. Excessive load: Every additional weight in the vehicle will correspondingly increase fuel consumption. Therefore, it is advisable to minimize the car's load and promptly remove unnecessary items from the trunk.

[KaydenMarie]

The high fuel consumption during the first refuel of a new car is mainly related to engine break-in. All internal engine components are new, such as piston rings and cylinder walls being tightly fitted, resulting in increased friction during operation and reduced efficiency, naturally leading to higher fuel consumption. Additionally, the lubrication system in a new car has unevenly distributed factory oil, providing insufficient protection and poor fuel economy. Moreover, first-time owners often drive excitedly, pressing the accelerator more aggressively, with frequent urban stop-and-go or sudden high-speed bursts, causing the fuel gauge to drop rapidly. Having driven many new cars, the break-in period typically lasts the first 500 to 1,000 kilometers. After this period, as components adapt, fuel consumption decreases. Gentle driving habits, avoiding sudden acceleration and braking, and checking tire pressure can also help save a significant amount of fuel.

[SanEverly]

When I bought my new car, I noticed that the first tank of fuel burned quickly, possibly due to driving habits. As a novice owner like me, I didn't know how to restrain myself and always wanted to test the performance, flooring the accelerator or braking frequently as soon as I hit the road—this behavior is particularly fuel-consuming during the break-in period. Additionally, the vehicle system is adapting, and the engine control unit initially calculates the fuel injection conservatively to avoid issues like stalling. New car tires are also stiff and not yet worn in, increasing rolling resistance. I recommend maintaining a steady driving rhythm from the start, cruising at a constant speed on highways or driving gently in the city. Once the components coordinate, fuel consumption will naturally decrease, and it can also extend the engine's lifespan.

[MacJohn]

High fuel consumption during the initial use of a new car is likely due to the engine's self-learning phase. New parts have greater friction, making operation more strenuous and increasing fuel usage; the control system isn't yet finely tuned, possibly leading to excessive fuel injection as a precaution against faults. Driving habits also contribute to the issue—aggressive maneuvers during test drives can cause fuel consumption to spike. From my experience, noticeable improvement occurs after the first two refuels.

[DelElliot]

The higher fuel consumption during the first refuel of a new car is, in my opinion, the result of multiple factors overlapping. New components have greater friction and lower efficiency; aggressive driving habits such as sudden braking and acceleration; and higher tire pressure increasing resistance. I recommend checking the normal tire pressure values and adopting a gentler driving style to allow the system to adapt. Fuel consumption will decrease after the break-in period, so there's no need to worry too much.

[Maximus]

I believe the high initial fuel consumption of a new car is fundamentally due to engine break-in. New components need time to run in and reduce friction; driving habits have a significant impact, with aggressive throttle use during test drives. The system calibration tends to be conservative, resulting in a temporary period of higher fuel consumption. When driving a new car, I patiently and gently drive for the first few thousand kilometers, and the fuel consumption noticeably improves afterward.