7 Simple Ways to Improve Fuel Efficiency Today

Nobody enjoys paying more at the bowser than they have to. And with prices at the servo being what they are, the idea of getting more kilometres out of every litre isn't just appealing , it's genuinely worth taking seriously.

Here's the encouraging part: you don't need to buy a new car, install expensive aftermarket parts, or change your lifestyle in any significant way to make a real difference. Most of the biggest efficiency improvements come from small changes in how you drive and how you maintain what you already own.

The seven strategies in this guide are practical, specific, and backed by solid data. Taken together, they can realistically shave 15–25% off your annual running costs , and some of them, you can act on today before you even get back in the car.

Why Efficiency Matters More Now Than It Did Five Years Ago

The average Australian household spends somewhere between $2,500 and $4,000 per year on vehicle fuel depending on how far they drive, what they drive, and where they live. For regional drivers covering greater distances, that figure is often higher.

A 20% improvement in efficiency translates to $500–$800 saved every year without spending a dollar on anything. Over five years, that's $2,500–$4,000 , the kind of money that funds a proper holiday, knocks a dent in a mortgage, or goes toward the next car deposit.

The seven strategies below aren't theoretical. They're the same approaches that experienced fleet managers, eco-driving instructors, and professional long-distance drivers use in the real world. They work on every petrol and diesel vehicle, regardless of make, model, or age.

Way 1: Check Your Tyre Pressure This Week

This is the easiest win available to almost every driver in Australia right now. Studies consistently show that a meaningful proportion of vehicles on Australian roads are running with at least one tyre below its recommended pressure , often without the driver knowing.

The Science Behind It

When a tyre is under-inflated, it has a larger contact patch with the road and flexes more during each rotation. This increased flexing generates heat and creates greater rolling resistance , the force opposing the tyre's forward motion. More rolling resistance means the engine works harder to maintain speed, which directly increases fuel consumption.

The numbers: tyres running 10% below recommended pressure increase rolling resistance by approximately 3%, adding around 2–3% to fuel consumption. Tyres at 20% below recommended , entirely possible on a car that hasn't had its pressure checked in six months , can add 5–7% to consumption.

How to Do It Right

•       Check when the tyres are cold , before driving, or less than 3 km from home. Driving heats the air inside the tyre and increases pressure readings, giving you a false result

•       Find the correct pressure on the tyre placard , this is a sticker inside the driver's door jamb. It shows recommended pressures for different load conditions. Don't use the maximum pressure stamped on the tyre sidewall , that's a different figure

•       Check all four tyres plus the spare

•       Do this monthly , tyres naturally lose 1–2 PSI per month through normal permeation through the rubber

•       Most servo air stations in Australia are free to use , or buy a $12 digital tyre gauge from any auto parts shop and keep it in the glovebox

What you can save: correct tyre pressure alone can recover 2–5% in fuel economy. On a $3,000 annual spend, that's $60–$150 per year. It takes five minutes and costs nothing.

Way 2: Change How You Accelerate

Aggressive acceleration is the single largest controllable cause of poor fuel economy in everyday driving. When you floor the accelerator from a standstill, the engine is demanding maximum fuel injection , it's doing the least efficient thing it knows how to do.

What Smooth Acceleration Looks Like

The goal isn't to be annoyingly slow off the mark , it's to accelerate progressively rather than instantly. Apply throttle smoothly and build speed over 5–10 seconds rather than arriving at 60 km/h in 3 seconds. You reach highway speed at almost the same time, but with a fraction of the fuel used.

A practical mental model: imagine a full cup of takeaway coffee sitting on the dashboard. Accelerate at the rate that wouldn't slosh it over. You'll feel the difference in the smoothness of the drive, and you'll see the difference in your consumption figures.

Gear Selection Matters Too

Manual transmission drivers: shift up early and keep revs low. Most petrol engines are at their most efficient between 1,500 and 2,500 RPM. Driving at 2,000 RPM uses significantly less fuel than the same speed at 3,500 RPM. Modern automatics are generally well-programmed to select efficient gears, but avoid using Sport mode or kickdown unless you genuinely need the acceleration.

The Data

Smooth, progressive acceleration versus aggressive acceleration , tested across a range of vehicles in typical city and suburban driving , consistently shows a fuel economy improvement of 10–15%. On a $3,000 annual fuel spend, that's $300–$450 in savings per year from changing one driving habit.

Way 3: Stop Braking Late

This sounds counterintuitive until you understand the physics. Braking converts kinetic energy , which you paid for with fuel , into heat through the brake pads. That energy is gone. Every time you brake heavily, you're discarding the momentum your engine worked to create.

The Art of Anticipating Traffic

The goal is to use that momentum rather than waste it. When you see a red light ahead, a roundabout, or traffic slowing, lift off the throttle early and let the car coast in gear toward the stop. Modern fuel-injected cars use virtually zero fuel during overrun , when the engine is being driven by the wheels rather than the other way around. Coasting to a smooth stop is almost free.

This requires looking ahead further than most drivers naturally do , typically 150–300 metres ahead in urban traffic rather than focusing on the car directly in front. It also makes you a smoother, calmer, safer driver as a by-product.

Following Distance Helps

Driving with a greater following distance from the car in front means you have more space to react gradually. When traffic ahead slows, you can ease off the throttle and coast rather than braking sharply because you're too close. The two-second rule is the legal minimum , in heavy stop-start traffic, more is better for both safety and efficiency.

What You Save

Anticipatory driving , combining smooth acceleration with early coasting , is estimated to improve economy by 10–20% in urban environments. Combined with smoother acceleration (Way 2), the aggregate saving from changing your driving style can be 15–25% in city conditions.

Way 4: Watch Your Highway Speed

This one has the most dramatic potential saving for anyone who does regular highway driving , and it's the one most Australians are least inclined to act on because the speed itself feels normal.

The Physics of Drag

Aerodynamic drag , the air resistance your car pushes through , increases with the square of velocity. Doubling your speed quadruples the drag force. In practical terms:

•       At 100 km/h, aerodynamic drag is a significant but manageable proportion of total resistance

•       At 110 km/h, drag increases by 21% compared to 100 km/h

•       At 120 km/h, drag increases by 44% compared to 100 km/h

•       At 130 km/h, drag nearly doubles compared to 100 km/h

This is why fuel consumption at 130 km/h can be 25–30% worse than the same car at 100 km/h. For a vehicle doing 10L/100km at 100 km/h, that's 12.5–13L/100km at 130 km/h.

The Real-World Calculation

On a 500 km trip at 130 km/h (12.5L/100km) versus 100 km/h (10L/100km):

•       At 130 km/h: 62.5 litres used

•       At 100 km/h: 50 litres used

•       Saving: 12.5 litres , worth approximately $24–$28 at current prices

•       Time cost: approximately 31 minutes longer at 100 km/h versus 130 km/h

Whether that half-hour is worth $25 is a decision only you can make. But the numbers are real, and on a regular long-haul route , say, Sydney to Canberra each month , the annual saving from travelling at 100 instead of 120–130 km/h adds up quickly.

Cruise Control Helps

Using cruise control on highways removes the small, constant speed variations that come from human throttle input. Even well-intentioned drivers naturally drift speed up and down by 5–8 km/h. Cruise control maintains exactly the set speed, which means the engine operates at a more consistent, efficient load point. This typically improves highway economy by 5–8% over equivalent distances driven without cruise.

Way 5: Remove Weight and Drag You're Not Using

Your car's fuel consumption is proportional to the work it needs to do. Weight increases the work required for acceleration and hill climbing. Aerodynamic attachments increase drag at speed. Every unnecessary kilogram and every extra square metre of frontal area costs you at the bowser.

Clear Out the Boot

Open your boot right now and look at what's in it. Tools you haven't used in months. Sports gear that stays in the car 'just in case'. Kids' equipment that lives there between weekend activities. Shopping bags, umbrellas, spare parts, old service items.

Every extra 50 kg of unnecessary load increases fuel consumption by approximately 1–2% in urban driving. A cluttered boot carrying 80 kg of miscellaneous gear is adding $30–$60 per year to your fuel bill , for items sitting in your car doing nothing.

Remove the Roof Rack When You're Not Using It

This is the one most people know about but ignore. An empty roof rack increases aerodynamic drag by 5–10% at highway speeds, adding meaningfully to fuel consumption on any route with significant highway driving.

A roof rack with a cargo box or empty pods is even worse , these can increase consumption by 20–25% at highway speeds. If you use the roof rack for camping twice a year and commute on a highway five days a week, the maths are firmly against leaving it on.

•       Remove roof racks, crossbars, and cargo boxes when not actively in use

•       Remove bull bars and heavy accessories if they're not needed for your current usage , these add both weight and frontal area

•       Even a towbar adds aerodynamic drag when not towing , if yours is removable, consider removing it for long highway trips

Way 6: Service Your Car on Schedule

A well-maintained engine is an efficient engine. Several of the most common service items directly affect fuel consumption , not in a dramatic, noticeable way day-to-day, but cumulatively across a service interval in a way that's very real in terms of money spent.

Fresh Engine Oil

Engine oil thickens and becomes contaminated over time. Older, degraded oil increases internal friction , the engine works slightly harder to pump and circulate it, and slightly harder at every bearing and journal surface. Fresh oil of the correct grade for your engine reduces this friction and can recover 1–3% in fuel economy.

For most Australian vehicles, this means an oil and filter service every 10,000 km or 12 months. Some modern engines with extended-interval synthetic oil specification can go to 15,000 km , check your owner's manual.

Clean Air Filter

A dirty air filter restricts the airflow into the engine, causing the fuel management system to compensate with richer fuelling , more fuel per combustion event. The effect builds gradually as the filter clogs, making it easy to miss day-to-day, but a significantly dirty air filter can degrade economy by 6–10%.

Air filters are typically inspected at each service and replaced when dirty , usually every 20,000–40,000 km for most driving conditions. In dusty environments , outback driving, dirt roads, agricultural work , they clog much faster.

Good Spark Plugs

Worn or fouled spark plugs cause incomplete combustion. The fuel doesn't fully burn, wasting energy and requiring the engine to use more to maintain performance. Modern iridium and platinum plugs have service lives of 60,000–100,000 km, but checking their condition at services is worthwhile , particularly if economy has degraded or the engine is running rough.

Service Savings Summary

Way 7: Buy Smarter at the Bowser

The first six ways are all about using less fuel per kilometre. This last one is about paying less per litre for the fuel you do use , which has the same net effect on your wallet.

Use the Weekly Price Cycle

Petrol prices in Australia's major cities , Sydney, Melbourne, Brisbane, Perth, Adelaide , follow a structured weekly cycle. Prices drop to their lowest point on a consistent day each week (commonly Tuesday or Wednesday in most cities) and then progressively rise over the following days to a peak, typically around Friday to Sunday.

The swing from the bottom to the top of the cycle can be 20–30 cents per litre in volatile weeks. If you fill up a 60-litre tank on the cheapest day versus the most expensive, you're saving $12–$18 per fill-up. Do that consistently across 20 fill-ups per year and it's $240–$360 saved annually for zero effort beyond timing.

Use a Price Comparison App

Within any given suburb, the price difference between the cheapest and most expensive servo can be 15–20 cents per litre on any given day. There's genuinely no reason to pay peak price when the cheapest option is a short detour.

•       MotorMouth , widely used Australian app; shows real-time prices and the weekly cycle pattern by city

•       GasBuddy , crowd-sourced pricing; useful for real-time spot comparisons

•       FuelWatch , Western Australia government scheme; publishes tomorrow's prices 24 hours ahead, making planning simple

•       Google Maps and Apple Maps , both show live prices at nearby servos in major Australian cities

Use Supermarket Discounts Strategically

Coles and Woolworths fuel discount vouchers typically offer 4 cents per litre off, with periodic promotions offering larger amounts. On a 60-litre fill-up, 4 cents per litre is $2.40. It's not life-changing on its own, but stacked with buying on the right day of the cycle and choosing the cheapest nearby servo, the combined effect adds up.

Use the Right Grade , No More

If your vehicle specifies 91 RON, use 91. Using 95 or 98 in a 91-spec engine delivers no measurable benefit , it just costs more per litre. Across a year of driving, the unnecessary premium for the higher grade on a vehicle that doesn't need it is typically $100–$200.

Conversely, if your vehicle specifies 95, use 95. Using 91 in a 95-spec engine causes retarded ignition timing, which reduces power and economy , often making the 'cheaper' grade more expensive per kilometre.

Your 7 Ways , What Each Is Worth

Here's an honest summary of the annual saving from each strategy for a typical driver covering 15,000 km per year at $2.00 per litre (approximate annual spend: $2,700):

Combined realistic saving: adopting all seven strategies consistently , not perfectly , can realistically reduce annual fuel spending by $600–$1,000 for the typical Australian driver. That's a real, repeatable saving from free changes to habits and straightforward maintenance.

A Note for Regional and Remote Australian Drivers

Everything above applies regardless of where you live in Australia, but for drivers in regional and remote areas, a few additional considerations apply.

•       Price apps are less useful in remote areas where there may only be one servo for 200 km , but knowing the cycle still matters in the last major town before you head out

•       For long outback runs, reducing cruise speed from 110 to 100 km/h saves a meaningful number of litres over 800 km. That can be the difference between making the next fuel stop comfortably and running close to empty

•       Corrugated dirt roads massively increase rolling resistance and fuel consumption , slowing down on rough unsealed roads is both safer and significantly more economical than maintaining highway speeds on rough surfaces

•       Carry a jerry can , if you're ever forced to buy at an isolated servo at a premium price, having a partial reserve means you can stretch to the next stop where prices are likely better

The Bottom Line

Seven strategies. Most of them free. All of them proven. The truth is, fuel efficiency isn't a mystery , it's the predictable result of how you drive, how you maintain your car, and how you buy the fuel you use.

You don't need a hybrid, you don't need expensive aftermarket modifications, and you don't need to change your lifestyle. Check your tyre pressure, drive smoothly, anticipate traffic, ease up on the highway speed where practical, lose the roof rack, keep to your service schedule, and use an app to find the cheapest litre near you.

Start with whichever one is easiest , probably tyre pressure or the price app , and add the others over time. Within a few months, the difference in your fill-up frequency and your monthly spend will be measurable. That's the point.

Frequently Asked Questions

How much can I realistically save by driving more smoothly?

Based on independent studies and fleet operator data, the difference between aggressive city driving and smooth, anticipatory driving consistently ranges from 10–20% in fuel economy. For a driver spending $3,000 per year on fuel with mostly city and suburban driving, smooth driving habits alone can save $300–$600 annually. The key changes are smooth acceleration from stops (no flooring it), coasting to traffic lights and intersections rather than braking sharply, and maintaining greater following distance. These habits become natural very quickly , most drivers who deliberately practise them for two to three weeks report that the smoother style feels more comfortable and less stressful, not just more economical.

Does air conditioning always hurt fuel economy?

Yes, but the impact varies significantly with conditions. At low speeds in stop-start city traffic on hot days, AC can add 10–15% to fuel consumption because the AC compressor is under constant load with little airflow to assist it. At highway speeds, the comparison changes: the aerodynamic drag from open windows at 100 km/h is roughly equivalent to the fuel cost of AC, meaning neither is dramatically better than the other. A practical approach: below 60 km/h in moderate temperatures, open windows are efficient. Above 80 km/h, or in extreme heat where the AC is working hard regardless, close the windows and run the AC. Using recirculation mode once the cabin is cooled reduces AC workload significantly.

Is it worth buying premium petrol to improve fuel economy?

No , not if your vehicle specifies standard 91 RON. Premium petrol (95 or 98 RON) has higher knock resistance, which benefits engines designed for it , turbocharged, high-compression , but delivers no additional energy content, no cleaning benefit, and no performance advantage in an engine calibrated for 91. You're paying more per litre for an octane headroom your engine cannot use. The exception is if your vehicle genuinely specifies 95 or 98 , in that case, using the correct grade is not a luxury, it's what the engine needs to run at its designed efficiency. The economy penalty from using 91 in a 95-spec engine (through retarded ignition timing) often makes 91 more expensive per kilometre than the specified higher grade