Top 10 Ways to Save on Fuel in Australia

With petrol prices constantly shifting — and global events like the Strait of Hormuz crisis pushing costs even higher — every Aussie driver is looking for ways to save on fuel. The good news? You don't need to trade in your car or change your lifestyle dramatically. Small, practical changes to how you drive, maintain your vehicle, and shop for petrol can add up to hundreds of dollars saved each year.

Here are the top 10 ways to save on fuel, backed by data from motoring authorities and real-world driving research.

1. Smooth and Steady Driving Saves Fuel

Aggressive driving is one of the biggest fuel wasters on the road. Rapid acceleration, hard braking, and constant speed changes force your engine to work much harder than it needs to.

According to the US Department of Energy, aggressive driving can lower fuel economy by 15–30% on highways and 10–40% in city traffic. That's a massive difference — and it applies just as much on Australian roads.

The fix is simple: accelerate gently, maintain a steady speed, and anticipate traffic flow so you can coast to a stop rather than slamming the brakes. Think of it as driving like you've got a cup of coffee on the dashboard.

2. Keep Your Tyres Properly Inflated

Under-inflated tyres create more rolling resistance, which means your engine has to burn more fuel to keep the car moving. It's one of the easiest things to check, yet most drivers overlook it.

A partnership study between Michelin and a major fleet operator found that maintaining correct tyre pressure across a fleet of 4,000 vehicles saved 60,000 litres of fuel. For everyday Aussie drivers, checking your tyre pressure fortnightly — especially before long trips — is a no-brainer.

You'll find the recommended pressure on a sticker inside your driver's side door jamb or in your owner's manual. Don't use the maximum pressure printed on the tyre sidewall — that's a different figure entirely.

3. Slow Down on the Highway

Speed kills your fuel economy almost as much as it increases your risk on the road. Aerodynamic drag increases roughly with the square of your speed, so the faster you go, the harder your engine works just to push through the air.

Studies show that fuel efficiency drops rapidly above 80–90 km/h. Cruising at 100 km/h instead of 110 km/h on the freeway might only add a few minutes to your trip but can save you a noticeable amount of fuel over a full tank.

If your car has cruise control, use it on the highway. It keeps your speed consistent and avoids the small accelerations and decelerations that waste fuel.

4. Reduce Unnecessary Weight and Drag

Carrying extra weight in your car — whether it's sports gear, tools, or boxes you keep meaning to unload — costs you fuel with every kilometre.

Even more costly are roof racks and roof boxes. The US Department of Energy reports that roof-mounted cargo can reduce fuel economy by up to 8% in city driving and up to 25% at highway speeds. If you're not using your roof racks, take them off. The aerodynamic improvement is worth the two minutes it takes.

Give your boot a clear-out while you're at it. Every extra kilogram your engine has to haul uses fuel.

5. Don't Idle Unnecessarily

Sitting in a parked car with the engine running burns fuel for absolutely no benefit. Modern engines don't need to "warm up" the way older cars did — most manufacturers recommend driving off gently after about 30 seconds.

Idling can burn anywhere from 1 to 2 litres of fuel per hour, depending on your engine size and whether the air conditioning is running. If you're waiting for someone or parked for more than 10–15 seconds, switch the engine off. Many newer cars have automatic stop-start systems for exactly this reason.

6. Use Air Conditioning Wisely

Air conditioning places a direct load on your engine, which means higher fuel consumption. On a hot Australian summer day, running the AC can increase fuel use by 5–10% depending on your vehicle and the conditions.

That doesn't mean you should swelter — but using the AC wisely helps. Park in the shade when possible, use the recirculate function once the cabin has cooled, and consider using the fan or opening windows at lower speeds instead.

At highway speeds, however, open windows create aerodynamic drag that can be worse than the AC. The rule of thumb: windows down around town, AC on the highway.

7. Combine Trips and Plan Your Route

Cold engines use significantly more fuel. When you start your car after it's been sitting for hours, the engine runs rich (using more fuel) until it reaches operating temperature. Several short trips from a cold start can use roughly twice the fuel of a single combined trip covering the same distance.

Plan your errands so you can do them in one loop rather than making separate trips. And if you have the option to work from home or carpool even one day a week, the fuel savings add up fast.

8. Keep Up with Regular Servicing

A well-maintained car is a fuel-efficient car. Worn spark plugs, clogged air filters, dragging brakes, and low or incorrect engine oil all contribute to higher fuel consumption.

According to the US Department of Energy, fixing a serious maintenance issue — such as a faulty oxygen sensor — can improve fuel economy by as much as 40%. Even using the correct grade of engine oil (as recommended in your owner's manual) can make a 1–2% difference.

Stick to your car's recommended service schedule. It's not just about reliability — it directly affects how much you spend at the bowser.

9. Fill Up at the Right Time — Use the Petrol Price Cycle

If you live in Sydney, Melbourne, Brisbane, Adelaide, or Perth, fuel prices follow a regular petrol price cycle. Prices rise sharply, then gradually fall over a period of days or weeks before spiking again. We explain how these cycles work and how to use them in our guide to petrol price cycles in Australia.

The ACCC tracks these cycles and confirms they're driven by retailer pricing policies. Filling up at the bottom of the cycle — rather than when prices are at their peak — can save you 15–30 cents per litre or more.

You can track where each city sits in its cycle right now on our price cycles page, or check our fuel map to find the cheapest station near you in seconds.

10. Compare Fuel Prices Before You Fill Up

This might be the simplest tip on the list, and potentially the most impactful. Fuel prices can vary by 20–40 cents per litre between servos just a few kilometres apart — especially in metro areas.

The ACCC's research shows that areas with more independent petrol retailers tend to have lower average prices. Seeking out these independents, or simply comparing prices before you fill up, can save you real money every single week.

Use a fuel price comparison tool like our fuel map to spot the cheapest petrol and diesel near you. Over the course of a year, choosing the cheapest servo consistently could save you $300–$500 or more, depending on how much you drive.

Bonus: Know What You're Really Getting

It's worth noting that the fuel economy figures quoted by car manufacturers don't always match real-world performance. The Australian Automobile Association's Real-World Testing Program has found that some vehicles consume up to 31% more fuel on the road than lab tests suggest. In fact, 76% of cars tested used more fuel than advertised.

This means you should take manufacturer claims with a grain of salt and track your own fuel consumption. Most modern cars display average fuel use on the dash — keep an eye on it and see how your driving habits affect the numbers.

Every Little Bit Counts

You don't need to do all ten things perfectly. Even adopting three or four of these ways to save on fuel will make a noticeable difference to your weekly spend. And when prices spike — as they have during the current global supply disruptions — these habits become even more valuable.

The key is consistency. Drive smoothly, maintain your car, and always compare prices before you fill up. Your wallet will thank you.