How to Save Money on Fuel Every Month

The average driver wastes 15–25% of their fuel through habits that are easily corrected. Unlike fixed costs — insurance, registration, loan repayments — fuel consumption responds directly to behaviour and vehicle condition. The changes below are practical, free to implement, and have measurable impact within a single tank.

1. Drive Smoothly — The Single Biggest Lever

Aggressive acceleration followed by hard braking is the most wasteful driving pattern. Every time you accelerate hard and then brake, you are converting fuel energy directly into heat through the brakes rather than into forward progress.

• Accelerate gently and progressively, not at full throttle from stops
• Look ahead — anticipate traffic lights, roundabouts, and slowing vehicles and lift off the accelerator early rather than braking late
• Use engine braking by lifting off the accelerator and letting the car slow naturally before braking
• Maintain a consistent speed on open roads rather than surging and braking in traffic flows

This one behaviour change alone reduces fuel consumption by 15–30% for city driving.

2. Maintain Correct Tyre Pressure

Under-inflated tyres increase rolling resistance — the energy required to move the tyre across the road surface. A tyre that is 10 PSI below its recommended pressure can increase fuel consumption by 2–3%. Across four tyres, this compounds.

Check tyre pressure monthly, ideally when tyres are cold (not recently driven). The correct pressure is printed on a sticker inside the driver's door frame, not on the tyre sidewall (which shows maximum pressure).

3. Remove Unnecessary Weight

Every 50 kg of extra weight increases fuel consumption by approximately 1–2%. Common culprits:

• Roof racks and bike racks when not in use — these also create aerodynamic drag at highway speeds
• Heavy equipment, tools, or sporting gear stored in the boot permanently
• Full water containers, sandbags, or other heavy items that accumulate over time

4. Minimise Short Cold-Start Trips

A petrol engine runs richly (using more fuel) for the first few minutes of operation while it reaches operating temperature. A trip of 2 km from a cold start uses disproportionately more fuel than the same 2 km at the end of a longer journey.

Consolidate short trips — combine errands into a single trip rather than making multiple short trips from home. If practical, walk or cycle for trips under 2 km.

5. Use Cruise Control on Highways

Maintaining a constant speed is more efficient than the natural speed variation that occurs with manual throttle control. Cruise control at 100 km/h is consistently more efficient than manual driving that fluctuates between 95–110 km/h. The effect is most pronounced on flat, straight highways.

6. Track Your Consumption to Find the Problems

If you are not measuring, you are not managing. Log every fill-up — odometer, litres pumped, price per litre — and calculate your L/100km. A worsening average tells you something is wrong before you would otherwise notice it. A sudden spike often indicates a specific issue: a slow tyre leak, a changed commute pattern, or a developing mechanical problem.

Frequently Asked Questions