How to Save Money on Petrol in Australia (2025 Guide)

The average Australian household spends $2,500–$4,500 per year on petrol. At current prices (around $1.90–$2.10/L in most capital cities), even modest changes to when you buy, how you drive, and what you drive can cut that bill by $500–$1,500 per year without any lifestyle sacrifice.

This guide covers 18 proven strategies — ranked roughly by impact. Start with the high-impact ones; every one you implement compounds on the last.

Quick Summary: Potential Annual Savings

1. Buy Petrol on the Cheapest Day of the Week

Australian petrol prices follow a weekly price cycle — a pattern where prices spike every 7–10 days, then gradually fall before spiking again. The cycle is most pronounced in Sydney, Melbourne, Brisbane, and Adelaide.

If you fill up a 60-litre tank and buy at the trough instead of the peak, you save 15–25 cents × 60 litres = $9–$15 per fill. At 20 fills per year, that is $180–$300 saved annually with zero extra effort.

See the full breakdown in our Best Time to Buy Petrol in Australia guide.

2. Use a Fuel Price Comparison App

Free apps that show real-time prices at every station in your area are one of the highest-return tools available. You should never pay more than necessary simply because a cheaper station is 2 km down the road.

• GasBuddy — national, crowd-sourced, updated in near-real-time. Best for major cities.
• PetrolSpy — especially strong in NSW and VIC.
• FuelWatch (WA only) — government-operated, prices confirmed the day before.
• NRMA Fuel Check (NSW) — official NSW government price monitoring.
• 7-Eleven Fuel Lock — unique feature: lock in a price for up to 7 days, redeem at any 7-Eleven.
• Ampol app — shows Ampol prices; Woolworths discount integration.

Tip: Check the app before you need fuel, not when you are already at a servo. Planning a fill-up on a day when prices are low AND at a cheaper station can save 20–30 cents per litre versus filling up at the nearest station at peak price.

3. Use Supermarket Fuel Discount Programs

Both major supermarket chains offer fuel discounts that are genuinely worth having:

• Woolworths Everyday Rewards — earn 1 point per $1 spent at Woolworths. Convert points to 4c/L off at Ampol stations (or more during booster events). Spend $50 in one transaction for an immediate 4c/L coupon.
• Coles Flybuys — similar structure at Shell/Coles Express. 4c/L for grocery spend, boosted to 8–10c/L during promo periods.

These are not life-changing individually — $48–$120/year — but they are free money with zero behaviour change if you already shop at these supermarkets. The boosted offers (often tied to spending $50 on specific products) can temporarily push the discount to 20c+/L and are worth watching.

4. Drive More Smoothly

Aggressive driving — hard acceleration, late heavy braking, rapid speed changes — is one of the biggest fuel wasters. Research consistently shows that smooth, anticipatory driving reduces fuel consumption by 10–30% compared to aggressive city driving.

The key habits:

• Accelerate gently — take 5–8 seconds to reach 60 km/h from a stop, not 2–3.
• Look further ahead — anticipate traffic lights and slow-moving vehicles. Lift your foot early and coast to the stop rather than braking at the last moment. Braking converts kinetic energy to heat; coasting retains it.
• Maintain consistent speed — use cruise control on the highway to eliminate speed oscillations that waste fuel.
• Keep a safe following distance — a larger gap gives you more time to react and coast, reducing the brake-accelerate cycle.

For the average Australian driver doing 13,000 km/year at 10 L/100km ($2.00/L), a 15% reduction in consumption saves approximately $390/year. Even a 5% improvement saves $130.

5. Maintain Correct Tyre Pressure

Under-inflated tyres increase rolling resistance — the engine burns more fuel to overcome it. The US Department of Energy estimates fuel economy decreases by 0.2% for every 1 PSI below recommended pressure. Most drivers are 5–10 PSI under-inflated on average.

What to do:

• Find the recommended pressure on the placard in the driver's door jamb (not the tyre sidewall, which shows maximum pressure).
• Check and inflate monthly — pressure drops approximately 1 PSI per month naturally.
• Check when tyres are cold (before driving or after less than 2 km).
• Free air is available at most Ampol, BP, and 7-Eleven stations.

A 10 PSI correction on all four tyres reduces fuel consumption by ~2%, saving $50–$100/year. It also extends tyre life by 10–20%, saving another $100–$200 per set of tyres.

6. Reduce Your Highway Speed

Aerodynamic drag increases with the square of velocity — driving 20% faster uses roughly 44% more fuel just to overcome air resistance. In practical terms:

On a Sydney–Melbourne drive (900 km), the difference between 110 km/h and 100 km/h is approximately $27 in fuel. For frequent highway drivers, even a 10 km/h reduction consistently saves $100–$250/year.

7. Minimise Idling

Most Australians idle far more than they realise — school pickups, drive-throughs, warming up the car, sitting in traffic. The fuel cost adds up:

• A 1.5L–2.0L petrol engine burns approximately 0.6–0.9 litres/hour at idle.
• Ten minutes of idling per day = approximately 36–54 litres/year = $72–$108 wasted.
• Modern fuel-injected engines are at operating temperature within 1–2 km of driving — there is no need to idle to “warm up”.

The rule of thumb: if you will be stationary for more than 60 seconds and it is safe to do so, switch the engine off. This is now law in some situations (e.g. idling near schools in NSW carries a $244 fine).

8. Use Air Conditioning Strategically

Air conditioning can add 5–25% to fuel consumption. That said, in hot Australian conditions, the correct trade-offs are:

• Under 60 km/h: windows down is more efficient than A/C (aerodynamic drag at these speeds is negligible).
• Above 80 km/h: A/C is more efficient than open windows (drag becomes significant).
• Park in shade / use a windscreen shade: reduces cabin temperature so A/C works less hard on initial cooling.
• Vent first: open windows briefly to expel hot air before turning on A/C to reduce the initial cooling load.
• Use recirculate mode: recirculating cabin air is 5–10% more efficient than drawing in hot outside air.

9. Remove Unnecessary Weight and Accessories

Every 100 kg of extra weight increases fuel consumption by approximately 0.3–0.5 L/100km. Items to remove when not in use:

• Roof racks and roof pods (add 5–15% drag when empty)
• Tow bars (can add 1–2% drag)
• Heavy tools, camping gear, or sports equipment left in the boot

A large empty roof pod at 120 km/h increases fuel consumption by 10–15%. At 15,000 km/year (assuming 50% highway driving), that is 45–75 extra litres/year — $90–$150 for something sitting unused on your roof.

10. Choose Premium Petrol Carefully

Premium unleaded (95 or 98 RON) is typically 10–25 cents/litre more expensive than regular unleaded (91 RON). It is only worth paying for if your vehicle requires or recommends it:

• Must use 95/98: turbocharged engines (many European and performance vehicles). Using 91 RON causes knock and can damage the engine.
• Recommended 95/98: some engines run better on premium — the power increase is 1–5%. If the extra cost is less than the fuel saving from better efficiency, it can be worth it. Calculator required.
• 91 RON is fine: most naturally aspirated engines — Toyota Corolla, Mazda 3, Honda Jazz. Paying for premium in these vehicles wastes money.

Check your fuel cap or owner’s manual. For vehicles recommending (not requiring) 95 RON: at a 15c premium and 8 L/100km consumption, premium costs $12 more per 1,000 km. You would need a sustained 4%+ efficiency gain to break even.

11. Maintain Your Vehicle Regularly

A poorly maintained engine burns significantly more fuel. Key maintenance items that affect fuel economy:

• Air filter: a clogged air filter can reduce fuel economy by 10–15%. Replace every 2 years or 30,000 km.
• Spark plugs: worn plugs misfire, wasting fuel. Replace at manufacturer intervals (typically 30,000–100,000 km depending on type).
• Engine oil: using the correct low-viscosity oil (e.g. 0W-20 instead of 10W-40 where recommended) reduces internal friction and saves 1–2% fuel.
• Oxygen sensor: a failed O2 sensor causes the engine to run rich (too much fuel). A $50 sensor replacement can restore 15% fuel economy.

12. Consolidate and Plan Your Trips

Cold starts use more fuel — in the first 5 km of driving, a petrol engine operates below optimal temperature and uses approximately 25% more fuel. Multiple short trips from a cold engine multiply this penalty:

• Six 3 km trips = 18 km but with six cold starts = much more fuel than one 18 km drive.
• Chain errands in one trip rather than multiple separate outings.
• Plan routes to avoid doubling back or unnecessary detours.

For a typical driver making 3 extra short solo trips per week, consolidating to 1–2 trips saves approximately $150–$250/year.

13. Consider Carpooling or Ride-Sharing

Splitting fuel costs with even one other commuter halves your fuel expense. For a daily 30 km round-trip commute at 10 L/100km and $2.00/L petrol:

• Solo commuter: $6/day, $1,500/year (250 working days)
• Carpooling with 1 other: $3/day, $750/year
• Carpooling with 2 others: $2/day, $500/year

Use the Carpool Fuel Split Calculator to work out fair cost splits.

14. Consider Fuel Cards for Business Drivers

Business owners and frequent drivers may benefit from a fuel card. Major options in Australia:

• Motorpass / Fleetcard — accepted at most stations, provides itemised reporting
• BP Plus — rebates of 2–4 cents/litre plus simplified GST invoicing
• Shell Card — similar rebates, good national network
• Ampol EasyPay — particularly suited to fleet operators

Beyond discounts, fuel cards make ATO fuel log compliance straightforward and GST claims easier. The administrative benefit often outweighs the per-litre discount.

15. Consider a Hybrid or More Fuel Efficient Vehicle

If you are due for a vehicle change, the fuel savings from switching to a hybrid can be dramatic:

A Toyota Corolla Hybrid over 5 years saves approximately $8,700 in fuel versus a 10 L/100km petrol car. See Hybrid vs Petrol Australia for the full break-even analysis including purchase price premium.

16. Monitor Your Fuel Economy

You cannot improve what you do not measure. Most modern cars show real-time fuel consumption on the instrument cluster — make a habit of watching it. The feedback loop is surprisingly powerful:

• Watch the instantaneous L/100km display accelerating and braking
• Log your fill-ups in a notebook or app (Fuelio, Drivvo) to track average consumption over time
• Sudden increases in consumption signal a maintenance issue

Drivers who monitor fuel economy actively tend to use 5–10% less fuel than those who don’t — just from the feedback effect on driving behaviour.

17. Plan for Cheaper Fuel on Road Trips

On long drives, regional petrol prices can vary dramatically. Regional towns away from major highways can be 20–40 cents/litre more expensive than metro prices. Planning strategies:

• Fill up in the last major city or town before entering remote areas
• Use GasBuddy to check prices ahead of route stops
• On the Pacific Highway or Hume Highway, roadhouse prices near the motorway are often higher — slight detours to adjacent towns save money on large tanks

Use the Trip Fuel Cost Calculator to plan fuel stops and budget for long-distance drives.

18. Reduce Your Annual Kilometres Where Possible

The single most effective way to cut petrol costs is to drive fewer kilometres. Options worth considering:

• Work from home — even 1 day per week saves 20% of commute fuel. On a 30 km round trip at $2.00/L, that is $312/year.
• Active transport — for trips under 5 km, cycling or walking eliminates fuel cost entirely and has health benefits.
• Public transport — for CBD commuters, a monthly Opal/Myki pass is typically cheaper than fuel + parking + depreciation.
• Combine remote work with driving days — consolidate in-office days to minimise daily commutes.

If you can eliminate 50 km per week from your driving (one fewer short-trip day), you save approximately 390 km/month, 4,680 km/year — around $900/year at typical fuel costs.

How Much Can You Actually Save?

Combining the accessible, low-effort strategies (right day to buy, price app, smooth driving, tyre pressure, supermarket discount) can realistically save $600–$1,200/year for the average Australian driver without changing vehicles or making major lifestyle changes.

Adding a vehicle upgrade (hybrid or smaller car) pushes potential savings to $1,500–$3,000/year depending on current vehicle and km driven.

Use the calculators below to see what your specific savings could be:

• Commute Fuel Cost Calculator — see exactly what your commute costs
• Fuel Economy Savings Calculator — compare vehicles
• Trip Fuel Cost Calculator — plan road trips
• Carpool Fuel Split Calculator — split costs fairly

Frequently Asked Questions