Why Your Car Is Consuming More Fuel, A Technical Breakdown of the Real Causes
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Have you noticed your car consuming more fuel without an obvious reason? The issue may be simpler than you expect, and the solution begins with understanding the real causes behind this increase. Are you ready to uncover them?
What is the most important step a driver can take to reduce fuel consumption?
- A driver should always start by checking the basic factors that directly affect fuel economy, such as tire pressure and the cleanliness of the air filters and fuel filters, since any issue in these components quickly increases consumption.
- After that, the driver should ensure the condition of the spark plugs and fuel injectors, as they are essential elements in the combustion process. Any weakness in them leads to incomplete combustion and noticeable fuel waste.
- Next comes reviewing daily driving habits, because sudden acceleration and frequent braking increase consumption more than any minor mechanical issue.
- Finally, regular maintenance serves as the primary line of defense, preserving engine efficiency and preventing small problems from accumulating into major increases in fuel consumption.
Does low tire pressure increase fuel consumption?
- When tire pressure drops, the contact surface with the road increases, raising rolling resistance and forcing the engine to work harder to move the vehicle.
- This additional effort directly increases fuel consumption, sometimes by 10% or more.
- The problem is that many drivers don’t notice low pressure until a warning appears, even though tires naturally lose air over time and with temperature changes.
- The solution is simple: check tire pressure every two weeks and adjust it according to the manufacturer’s recommendations, especially before long trips or when the weather changes.
Does Sport Mode increase fuel consumption?
- When Sport Mode is activated, the vehicle’s programming changes entirely: acceleration becomes sharper, and engine RPM stays higher for longer before shifting gears.
- This means more fuel is injected with every press of the accelerator, even during city driving.
- While Sport Mode offers enjoyable performance, it is not suitable for daily use, especially in traffic or short trips.
- It’s best reserved for specific situations, such as overtaking or driving on open roads.
Does extra weight inside the car affect fuel economy?
- Every additional kilogram adds load on the engine, especially during acceleration or climbing hills.
- Heavy items in the trunk or on the roof increase air resistance and negatively affect the vehicle’s aerodynamics.
- These details may seem minor, but they can increase fuel consumption by 2% to 4% for every extra 50 kg.
- It’s better to remove unnecessary items, especially heavy tools or storage boxes that serve no immediate purpose.
Can using the wrong fuel or engine oil increase fuel consumption?
- Using fuel with an octane rating lower than required leads to incomplete combustion, forcing the ECU to adjust ignition timing to compensate.
- This adjustment reduces engine efficiency and noticeably increases fuel consumption.
- Likewise, using engine oil with the wrong viscosity increases internal friction and makes engine movement heavier.
- Following the manufacturer’s recommendations for fuel type and oil viscosity is the best way to maintain performance and fuel economy.
Does delaying oil changes increase fuel consumption?
- Old oil loses its properties over time, becoming thicker and less capable of proper lubrication.
- This makes engine components move with more difficulty, causing the engine to burn extra fuel to compensate for the loss of smoothness.
- Dirty oil also carries contaminants that affect combustion and increase engine temperature.
- Changing oil on time is not a luxury—it’s essential for maintaining fuel efficiency.
Does a dirty air filter cause higher fuel consumption?
- The air filter regulates the amount of air entering the engine, and any blockage disrupts the air–fuel ratio.
- When air decreases, the ECU injects more fuel to compensate, leading to imperfect combustion and higher consumption.
- A dirty filter also reduces throttle response and slows acceleration.
- Replacing it every 10,000–20,000 km improves performance and noticeably reduces consumption.
Do faulty fuel injectors increase fuel consumption?
- Dirty or damaged injectors fail to spray fuel evenly, causing uneven combustion inside the cylinders.
- This forces the engine to inject more fuel to compensate for the loss of power.
- You may notice slight vibrations, reduced torque, or the smell of unburned fuel.
- Cleaning or inspecting injectors regularly solves the issue before it worsens.
Do worn spark plugs increase fuel consumption?
- Spark plugs are responsible for igniting the air–fuel mixture, and any weakness in them leads to incomplete combustion.
- Incomplete combustion means direct fuel waste and reduced engine power.
- Symptoms may include hard starting or engine shaking at idle.
- Replacing spark plugs on schedule maintains combustion efficiency and reduces consumption.
Does driving style affect fuel consumption?
- Aggressive driving—such as sudden acceleration and hard braking—burns large amounts of fuel within seconds.
- Frequent stop‑and‑go driving in cities strains the engine and can increase consumption by up to 30%.
- Maintaining a steady speed on highways significantly reduces consumption and keeps combustion smooth.
- Calm driving is not only economical—it extends engine life.
Does using the air conditioner increase fuel consumption?
- Running the AC adds extra load on the engine, especially in small cars or those with weaker engines.
- It can increase consumption by 10% to 25%, depending on temperature and AC power.
- In traffic, the effect is greater because the car operates at low speeds.
- The solution is to use the AC moderately and open the windows only at low speeds.
FAQs
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Causes of Sudden Loud Exhaust Noise and How to Fix It
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The exhaust sound can suddenly become louder without warning, turning driving into an annoying and worrying experience. What are the hidden causes behind this loud noise, and how can it be fixed quickly?
What are the most common causes of a sudden increase in exhaust noise?
- Corrosion or rust in the muffler, leading to cracks that allow exhaust gases to escape without proper silencing.
- A hole or crack in the exhaust pipe caused by hitting speed bumps or underbody impacts.
- Damage to the internal baffles inside the muffler, reducing its ability to absorb noise.
- A leak in the exhaust manifold, causing gases to escape before reaching the muffler.
- A damaged or clogged resonator, which alters the exhaust tone and increases sharpness.
- Issues in the catalytic converter that force exhaust gases out with higher-than-normal pressure.
What signs indicate a problem in the exhaust system?
- A loud roaring noise coming from underneath the vehicle.
- A hissing sound indicating a gas leak from the pipe or manifold.
- Noticing exhaust fumes inside the cabin, which is a dangerous warning sign.
- Vibrations in the pedals or vehicle floor during operation.
- Reduced engine performance or increased fuel consumption.
What are the basic steps to inspect the exhaust system yourself?
- Start the engine and listen carefully to locate the source of the noise or leak.
- Inspect the lower exhaust pipes for rust or holes.
- Ensure the rubber hangers supporting the exhaust system are intact.
- Check the catalytic converter for signs of clogging or damage.
- Observe any unusual vibrations when pressing the accelerator.
Can backfire cause a sudden increase in exhaust noise?
- Yes, a backfire inside the exhaust system produces a loud, sudden popping sound.
- Backfire usually occurs due to incomplete combustion inside the combustion chamber.
- Faults in the ignition system or spark plugs may allow unburned fuel to enter the exhaust.
- An imbalanced air–fuel mixture (too rich or too lean) leads to irregular combustion inside the exhaust.
- Using low‑quality fuel increases the likelihood of backfire.
How does an exhaust manifold leak increase exhaust noise?
- A manifold leak allows gases to escape before passing through the muffler, creating loud noise.
- The leak disrupts the backpressure needed for optimal engine performance.
- It may cause strong vibrations due to irregular gas flow.
- The leak is often caused by a burnt gasket or cracks in the manifold body.
Are speed bumps a hidden cause of loud exhaust noise?
- Yes, driving quickly over speed bumps can cause the exhaust system to hit the ground.
- This impact may create dents or cracks in the exhaust pipe.
- The rubber hangers may get damaged, causing the exhaust to vibrate and produce noise.
- Over time, these issues develop into gas leaks and noticeably loud exhaust noise.
How can a hole or crack in the exhaust be repaired?
- Small holes can be repaired using electric exhaust welding.
- If welding is not available, a thermal exhaust patch can be used as a temporary fix.
- The area must be cleaned thoroughly before repair to ensure proper adhesion.
- If the hole is large, replacing the damaged section is usually the best solution.
How can you prevent loud exhaust noise in the future?
- Avoid driving quickly over speed bumps to protect the exhaust pipe.
- Use high‑quality fuel to reduce the chances of backfire.
- Inspect the exhaust system every six months.
- Clean the resonator and muffler when needed to prevent buildup.
- Address any unusual noise immediately before the problem worsens.
Why Your Car Is Consuming More Fuel, A Technical Breakdown of the Real Causes
Table Of Contents:
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Have you noticed your car consuming more fuel without an obvious reason? The issue may be simpler than you expect, and the solution begins with understanding the real causes behind this increase. Are you ready to uncover them?
What is the most important step a driver can take to reduce fuel consumption?
- A driver should always start by checking the basic factors that directly affect fuel economy, such as tire pressure and the cleanliness of the air filters and fuel filters, since any issue in these components quickly increases consumption.
- After that, the driver should ensure the condition of the spark plugs and fuel injectors, as they are essential elements in the combustion process. Any weakness in them leads to incomplete combustion and noticeable fuel waste.
- Next comes reviewing daily driving habits, because sudden acceleration and frequent braking increase consumption more than any minor mechanical issue.
- Finally, regular maintenance serves as the primary line of defense, preserving engine efficiency and preventing small problems from accumulating into major increases in fuel consumption.
Does low tire pressure increase fuel consumption?
- When tire pressure drops, the contact surface with the road increases, raising rolling resistance and forcing the engine to work harder to move the vehicle.
- This additional effort directly increases fuel consumption, sometimes by 10% or more.
- The problem is that many drivers don’t notice low pressure until a warning appears, even though tires naturally lose air over time and with temperature changes.
- The solution is simple: check tire pressure every two weeks and adjust it according to the manufacturer’s recommendations, especially before long trips or when the weather changes.
Does Sport Mode increase fuel consumption?
- When Sport Mode is activated, the vehicle’s programming changes entirely: acceleration becomes sharper, and engine RPM stays higher for longer before shifting gears.
- This means more fuel is injected with every press of the accelerator, even during city driving.
- While Sport Mode offers enjoyable performance, it is not suitable for daily use, especially in traffic or short trips.
- It’s best reserved for specific situations, such as overtaking or driving on open roads.
Does extra weight inside the car affect fuel economy?
- Every additional kilogram adds load on the engine, especially during acceleration or climbing hills.
- Heavy items in the trunk or on the roof increase air resistance and negatively affect the vehicle’s aerodynamics.
- These details may seem minor, but they can increase fuel consumption by 2% to 4% for every extra 50 kg.
- It’s better to remove unnecessary items, especially heavy tools or storage boxes that serve no immediate purpose.
Can using the wrong fuel or engine oil increase fuel consumption?
- Using fuel with an octane rating lower than required leads to incomplete combustion, forcing the ECU to adjust ignition timing to compensate.
- This adjustment reduces engine efficiency and noticeably increases fuel consumption.
- Likewise, using engine oil with the wrong viscosity increases internal friction and makes engine movement heavier.
- Following the manufacturer’s recommendations for fuel type and oil viscosity is the best way to maintain performance and fuel economy.
Does delaying oil changes increase fuel consumption?
- Old oil loses its properties over time, becoming thicker and less capable of proper lubrication.
- This makes engine components move with more difficulty, causing the engine to burn extra fuel to compensate for the loss of smoothness.
- Dirty oil also carries contaminants that affect combustion and increase engine temperature.
- Changing oil on time is not a luxury—it’s essential for maintaining fuel efficiency.
Does a dirty air filter cause higher fuel consumption?
- The air filter regulates the amount of air entering the engine, and any blockage disrupts the air–fuel ratio.
- When air decreases, the ECU injects more fuel to compensate, leading to imperfect combustion and higher consumption.
- A dirty filter also reduces throttle response and slows acceleration.
- Replacing it every 10,000–20,000 km improves performance and noticeably reduces consumption.
Do faulty fuel injectors increase fuel consumption?
- Dirty or damaged injectors fail to spray fuel evenly, causing uneven combustion inside the cylinders.
- This forces the engine to inject more fuel to compensate for the loss of power.
- You may notice slight vibrations, reduced torque, or the smell of unburned fuel.
- Cleaning or inspecting injectors regularly solves the issue before it worsens.
Do worn spark plugs increase fuel consumption?
- Spark plugs are responsible for igniting the air–fuel mixture, and any weakness in them leads to incomplete combustion.
- Incomplete combustion means direct fuel waste and reduced engine power.
- Symptoms may include hard starting or engine shaking at idle.
- Replacing spark plugs on schedule maintains combustion efficiency and reduces consumption.
Does driving style affect fuel consumption?
- Aggressive driving—such as sudden acceleration and hard braking—burns large amounts of fuel within seconds.
- Frequent stop‑and‑go driving in cities strains the engine and can increase consumption by up to 30%.
- Maintaining a steady speed on highways significantly reduces consumption and keeps combustion smooth.
- Calm driving is not only economical—it extends engine life.
Does using the air conditioner increase fuel consumption?
- Running the AC adds extra load on the engine, especially in small cars or those with weaker engines.
- It can increase consumption by 10% to 25%, depending on temperature and AC power.
- In traffic, the effect is greater because the car operates at low speeds.
- The solution is to use the AC moderately and open the windows only at low speeds.
The types of brake fluid, their importance and uses of each type
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What is Brake Fluid?
Brake fluid is a hydraulic liquid used in braking systems to transfer the force generated by pressing the brake pedal to the calipers, which then clamp onto the brake discs to stop the vehicle. This fluid is characterized by unique properties, most notably its high resistance to heat without boiling, and its incompressibility, which ensures precise and effective brake response under various driving conditions.
Why is Brake Fluid Important?
Brake fluid does more than just transmit hydraulic pressure. It performs several critical functions that help maintain system efficiency and driving safety, including:
1- Protecting brake system components from corrosion and rust
2- Absorbing heat generated by friction, helping preserve performance
3- Resisting boiling at high temperatures, preventing brake fade in extreme conditions
What’s the Difference Between DOT 3, DOT 4, and DOT 5.1 Brake Fluids?
Brake fluid types differ in their heat tolerance, moisture absorption rates, and compatibility with various braking systems. Key differences include:
DOT 3
- - Dry boiling point: approximately 205°C
- - Wet boiling point: around 140°C
- - Moderate moisture absorption
- - Suitable for regular driving in mild conditions
- - Compatible with DOT 4 and DOT 5.1
- - Loses about 25% of its boiling point when absorbing 3% moisture
DOT 4
- - Dry boiling point: approximately 230°C
- - Wet boiling point: around 155°C
- - Absorbs moisture faster than DOT 3
- - Preferred for mid-performance vehicles or hotter climates
- - Compatible with DOT 3 and DOT 5.1
- - Loses about 50% of its boiling point when absorbing 2% moisture
DOT 5.1
- - Highest boiling points: dry at around 260°C, wet at 180°C
- - Highest moisture absorption rate
- - Ideal for high-performance or heavy-use vehicles
- - Compatible with DOT 3 and DOT 4
How to Choose the Right Brake Fluid
Selecting the appropriate brake fluid requires considering several factors to ensure compatibility and optimal performance:
- Vehicle specifications: Always refer to the owner's manual for the manufacturer’s recommended type
- Driving conditions: For high-temperature environments or heavy loads, DOT 4 or DOT 5.1 is preferable
- System compatibility: DOT 5 is not compatible with DOT 3 or DOT 4
- Brand reliability: Choose a trusted brand for long-term performance and stability
How to Easily Check Brake Fluid Condition
Over time, brake fluid deteriorates due to moisture absorption and contamination, which affects braking performance. Regular checks are essential. Practical methods include:
Moisture Measurement
- Tool: Small electronic device with a probe
- Method: Dip the probe into the reservoir after warming the fluid slightly by driving
- Result: If moisture exceeds 3%, replace the fluid immediately
Electrical Conductivity Test
- Concept: Pure fluid doesn’t conduct electricity, but contaminated fluid does
- Method: Some devices measure conductivity to assess fluid quality
- Result: Low resistance indicates contamination and the need for replacement
Chemical Test Strip
- Tool: A strip that changes color based on fluid condition
- Steps:
- - Dip the strip into the fluid for a few seconds
- - Wait one minute and compare the color to the reference chart
- - Result: Significant color change indicates moisture or impurities; fluid should be replaced
Copper Content Measurement
- Background: Brake line corrosion releases copper into the fluid
- Method: Special test strips detect copper levels
- Result: If copper exceeds 200 ppm, it signals early corrosion and fluid replacement is necessary
Can You Mix Different Brake Fluid Types?
Mixing is not recommended, especially if the chemical compositions are incompatible.
When Should Brake Fluid Be Replaced?
It’s advisable to replace it every two to three years, or every 60,000 kilometers.
What Happens If Brake Fluid Runs Low?
Low brake fluid can lead to:
- - Reduced braking response
- - Warning light activation on the dashboard
- - Air entering the system, increasing the risk of brake failure
What is the ABS system in cars? How does it work and what are the signs of its failure?
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When you slam on the brakes and the car loses traction, the situation can quickly turn dangerous and may end in a complete skid. This is where the ABS system steps in as a lifesaving solution that restores control… but what happens if this system suddenly fails?
What Is the ABS System and Why Is It Essential for Vehicle Safety?
- The Anti-lock Braking System (ABS) prevents the wheels from locking up during sudden or hard braking.
- It helps reduce stopping distance and allows the driver to maintain steering control, especially on wet or slippery roads.
- ABS is considered one of the most important modern safety systems and plays a major role in reducing accidents caused by emergency braking.
Main Components of the ABS System
- Wheel Speed Sensors: Monitor the rotation of each wheel and detect any abnormal deceleration.
- Electronic Control Unit (ECU): Analyzes sensor data and makes split‑second decisions.
- Hydraulic Control Unit (HCU): Executes ECU commands by adjusting brake fluid pressure.
- High‑response Valves: Open and close rapidly to regulate hydraulic pressure.
- Hydraulic Pump: Restores pressure after it has been reduced to prevent wheel lockup.
How Does ABS Work During Emergency Braking?
- When the driver applies heavy braking, the wheel speed sensors send real‑time data to the ECU.
- If the ECU detects that a wheel is about to lock, it immediately commands a reduction in pressure on that wheel.
- Pressure is modulated through three repeating phases: hold – release – reapply.
- This cycle can occur up to 20 times per second, preventing skidding and maintaining vehicle stability.
How Can the Driver Tell if ABS Is Functioning Normally?
- Light vibrations or pulsations in the brake pedal during hard braking.
- A humming or clicking sound from under the vehicle during sudden stops.
- Slight pedal resistance, indicating that the system is actively preventing wheel lock.
Signs of ABS Failure
- The ABS warning light illuminates on the dashboard — the most common indicator.
- Increased stopping distance or the car skidding easily during braking.
- Abnormal vibrations or excessive stiffness in the brake pedal.
- Speedometer malfunction in some vehicles due to its reliance on ABS sensors.
- Unusual noises when pressing the brakes.
Common Causes of ABS Malfunction
- Damaged wheel speed sensors due to dirt, impact, or corrosion.
- Broken or worn wiring that disrupts signal transmission to the ECU.
- Weak or non‑functional hydraulic pump.
- Low brake fluid level or air trapped in the system.
- ECU failure caused by moisture or overheating.
How ABS Failure Affects Other Safety Systems
- ABS is interconnected with systems like Traction Control System (TCS) and Electronic Stability Control (ESC).
- A malfunctioning ABS may disable these systems as well, reducing vehicle stability in corners.
- Multiple warning lights may appear on the dashboard, confusing the driver and increasing driving risk.
Can You Drive With a Faulty ABS? And What Does Repair Cost?
Driving is still possible, but without the enhanced safety ABS provides — especially in emergencies.
The brakes will function normally, but you will lose steering control during sudden braking.
Repair costs vary depending on the issue:
- Cleaning or replacing a sensor: Low cost
- Repairing the ABS module: Moderate cost
- Replacing the entire ABS unit: High cost
Launch event of the new 2026 Commander
As part of strengthening strategic partnerships among leading companies in the automotive sector, Saleh Cars Group, in collaboration with Petromin, hosted a distinguished official event to unveil the all-new Commander 2026 model.
The ceremony was attended by:
- Terence Patrick Perrin – Chief Executive Officer
- Rami Hankir – Senior Executive Director
- Elias Abu Hasira – Executive Director of Wholesale Sales
- Rohit Verma – Executive Director of Marketing
Alongside a number of automotive industry enthusiasts.
The event took place at Saleh Cars Group’s headquarters in Riyadh – Al Thumama Branch, at 3:30 PM on Tuesday, October 14, 2025.
The launch showcased the vehicle’s latest features and advanced technologies, reflecting both companies’ vision to deliver cutting-edge models to the Saudi market.
The Hidden Dangers of Using the Wrong Radiator Fluid
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Many drivers overlook the importance of radiator coolant color, assuming it's just cosmetic. But choosing the wrong type can lead to serious engine damage. So, what are the differences between coolant types—and which one is right for your car?
What Is Radiator Coolant?
Radiator coolant, also known as antifreeze, is a chemical compound used to regulate engine temperature. Its primary function is to prevent the engine from overheating in hot conditions or freezing in cold ones, protecting internal components from corrosion and damage.
Coolant is typically made from ethylene glycol or propylene glycol, with added corrosion inhibitors and thermal stabilizers.
Types of Radiator Coolant and Their Differences
Coolants used in radiator systems fall into three main categories, each with distinct properties that directly affect engine performance and efficiency:
1. Regular Water
Although easily accessible, using plain water in the cooling system is unsafe. It contains high levels of salts and impurities that accumulate inside the radiator and engine components, causing corrosion, rust, and long-term damage.
Water also boils quickly and freezes easily, making it unsuitable for temperature fluctuations.
2. Green Coolant
Green coolant is a balanced mixture of water and specially formulated chemicals designed to cool the engine efficiently without reacting with its metal components. Key features include:
- Free from salts and impurities, preventing corrosion and rust
- Boiling point raised to 120°C, making it effective in high-temperature conditions
- Commonly used in older vehicles or those with iron-based components
- Safe and effective, though its lifespan is shorter than other types
3. Red Coolant
Red coolant shares the impurity-free nature of green coolant but offers enhanced features:
- Contains agents that prevent freezing in extremely low temperatures
- Free from silicates, which can cause long-term corrosion in engine parts
- Used in modern vehicles requiring extra protection for sensitive metal components
- Longer lifespan than green coolant, ideal for cold climates
Causes of Coolant Boiling in the Radiator
Boiling coolant is a serious warning sign of a malfunctioning cooling system. Ignoring it can damage vital car components. Common causes include:
- Faulty Thermostat: Regulates coolant flow between the radiator and engine. If it fails, the engine doesn’t receive adequate cooling, leading to overheating and boiling.
- Cooling Fan Failure: The fan plays a crucial role in cooling the radiator. If it stops or underperforms, engine temperature rises, causing the coolant to boil.
- Damaged Radiator Cap: Should be replaced every two years. A worn or loose cap affects system pressure and reduces the radiator’s ability to maintain proper temperature, contributing to boiling.
Causes of Coolant Loss in the Radiator
All coolant types can decrease over time due to mechanical or operational issues affecting system efficiency. Key causes include:
- Faulty Thermostat: Disrupts temperature regulation, leading to coolant loss
- Cooling Fan Malfunction: Reduces radiator cooling, increasing coolant consumption
- Water Pump Failure: Responsible for circulating coolant to the engine; any damage causes noticeable fluid loss
- Leaks or Cracks: In radiator pipes or the reservoir tank, leading to gradual coolant reduction
- Heavy A/C Usage: Prolonged use increases pressure on the cooling system, accelerating coolant consumption
When Should You Change Your Coolant?
Coolant replacement depends on its type and chemical composition:
- Red Coolant: Recommended every 4 to 5 years due to its long-lasting organic formula
- Green Coolant: Should be replaced every 2 to 3 years, as its protective agents degrade over time
What’s the difference between green and red coolant?
Green contains silicates and has a shorter lifespan; red is silicate-free and lasts longer.
Can you mix coolant colors?
No. Chemical reactions between types can damage the cooling system.