What are the reasons for a new car consuming excessive fuel?

[LeSophie]

The reasons for a new car consuming excessive fuel are: 1. The driver's skill level is low, lacking driving experience; 2. The new car is in the break-in period, and many components require lubrication. The methods for using a new car during the break-in period are: 1. Preheating the cold car, as proper warm-up allows the engine oil to lubricate the engine internals effectively, reducing wear; 2. Timely maintenance is required for new cars during the break-in period. The reasons for a car consuming excessive fuel are: 1. Damaged pistons or piston rings, leading to oil burning and incomplete fuel combustion; 2. Inexperienced drivers keeping the accelerator pressed without lifting, not paying attention to shifting gears, inadvertently increasing fuel consumption; 3. Aging machinery, malfunctioning fuel control system; 4. Damaged fuel tank or fuel lines, causing fuel leakage; 5. Faulty oxygen sensor or partially clogged catalytic converter.

[LeJesse]

I found my new car is particularly fuel-consuming after purchase, guess why? New cars have a break-in period during the first few thousand kilometers, where the rough surfaces of engine components cause higher friction and lower efficiency. Plus, the excitement of driving a new car often leads to frequent hard acceleration and braking, and the constant stop-and-go in city traffic consumes more fuel. Having the entertainment system and air conditioning on also drains energy. I suggest maintaining a steady speed of 60-80 km/h for the first month, preferably on long trips, to allow the engine to break in naturally; regularly check tire pressure, as low pressure increases rolling resistance. After the break-in period, observe the fuel consumption again, and it will likely return to normal. Don’t panic if your new car is fuel-hungry—adjusting your driving habits will solve it, unlike me who worried unnecessarily about changing the engine oil and such.

[OGianna]

New cars often feel fuel-inefficient initially, primarily due to mechanical break-in and electronic systems. The engine components have larger gaps and insufficient lubrication during the first 500-1,000 km, making higher fuel consumption normal. Additionally, modern vehicles are equipped with complex sensors, brake assist, or auto start-stop systems that consume power during the adaptation phase. Driving habits also matter: aggressive acceleration or prolonged AC use in a new car can spike fuel consumption. I typically recommend smooth driving, avoiding full throttle, and checking the owner’s manual for break-in guidelines. Once parts wear in properly, fuel efficiency improves naturally. In short, don’t stress over initial high fuel usage—it stabilizes with sensible driving in a few weeks.

[Brianna]

High fuel consumption in new cars may stem from weight and aerodynamic resistance design. Enhanced safety in modern vehicles leads to reinforced bodies, increasing overall weight, while larger tires add to rolling friction. Poor aerodynamic optimization results in significant wind resistance at high speeds, consuming more fuel. The break-in period of new cars also hampers efficiency. Several cars I've driven were like this, guzzling fuel heavily in the first few weeks. Recommendations include carrying less cargo and minimizing roof racks; maintaining standard tire pressure. If high fuel consumption persists, a simple check at a repair shop might reveal minor faults.

[Miller]

New cars consume more fuel due to environmental factors and driving habits. In cold weather, the engine warms up slowly, increasing fuel consumption; on mountainous roads or in traffic jams, the engine often operates in inefficient zones. New car owners tend to test performance, with sudden starts, stops, and high-speed driving wasting fuel. From an environmental perspective, higher fuel consumption also means more emissions. It is recommended to accelerate gently when starting and use cruise control on highways; avoid idling the engine with the air conditioning on. Regularly check the air filter, as a dirty one restricts airflow. Fuel efficiency improves after the break-in period, but developing economical driving habits ensures long-term savings.