Why Your Fuel Consumption Suddenly Increased

If you find yourself visiting the petrol station more frequently, even though your driving habits haven’t changed. With this, your car may be trying to tell you something.

A sudden increase in fuel consumption is usually a sign of inefficiency or a developing mechanical issue. While some causes are simple, others can lead to costly repairs if ignored.

1. Underinflated or Worn Tyres

Tyres with low air pressure create more rolling resistance, forcing the engine to work harder.

Signs:

• Car feels heavier

• Reduced acceleration

• Uneven tyre wear

Fix:
Check tyre pressure monthly and inflate to manufacturer-recommended levels.

2. Dirty or Clogged Air Filter

The engine needs clean air for efficient combustion. A clogged air filter restricts airflow and increases fuel usage.

Signs:

• Sluggish performance

• Poor throttle response

Fix:
Replace the air filter during regular servicing.

3. Old or Incorrect Engine Oil

Using the wrong oil viscosity or overdue oil changes increases friction inside the engine.

Signs:

• Engine feels rough

• Reduced efficiency

Fix:
Use OEM-recommended engine oil and follow proper service intervals.

4. Faulty Oxygen Sensor or Mass Air Flow Sensor

These sensors regulate the air-fuel mixture. When faulty, the engine may inject excess fuel.

Signs:

• Check engine light

• Black exhaust smoke

• Strong fuel smell

Fix:
Professional diagnostic scan and sensor replacement if needed.

5. Engine Running Too Rich

When too much fuel is injected, combustion becomes inefficient.

Common causes:

• Faulty fuel injectors

• Sensor errors

• ECU miscalculations

Fix:
Diagnostic testing and tuning.

6. Aggressive Driving Habits

Sudden acceleration, high RPM driving, and frequent short trips increase fuel usage.

Fix:
Smooth acceleration and steady cruising help improve fuel economy.

7. Brake Drag or Sticking Brake Caliper

A partially engaged brake creates resistance even when you’re not braking.

Signs:

• Burning smell

• Hot wheels after driving

Fix:
Brake inspection and repair.

8. Engine Temperature Running Too Low or Too High

An engine that doesn’t reach optimal temperature burns fuel inefficiently.

Common causes:

• Faulty thermostat

• Cooling system issues

Fix:
Cooling system inspection.

9. Check Engine Light Ignored

When the ECU detects inefficiency, it may switch to a “safe mode” that uses more fuel.

Fix:Don’t ignore warning lights, early diagnostics save fuel and money.

How We Diagnose High Fuel Consumption at TT Motorsport

Our diagnostic process includes:

1. ECU fault scan

2. Sensor performance checks

3. Fuel system inspection

4. Brake and drivetrain resistance checks

5. Engine efficiency assessment

We identify the real cause, not just the symptom.

Contact us:
https://ttmotorsport.sg/contact