David KellyIreland's fuel crisis hit five days of street blockades this week — and Australian drivers are now feeling the ripple effects at the bowser. Here's what a mechanic wants you to know about protecting your car (and your wallet) when global fuel prices spiral.
Ireland's Fuel Protests: Why They Matter in Australia
On 7 April 2026, Irish truckers and farmers began blocking fuel depots across the country, sparked by petrol prices hitting €1.881 per litre and diesel climbing to €2.099 per litre — 4.7% and 2.9% above the EU average respectively. By day five, approximately 500 service stations had run dry and the Irish Army had been placed on standby to clear blockades around the Whitegate oil refinery, Ireland's only fuel processing facility.
The root cause: the ongoing Iran-UK conflict has disrupted shipping through the Strait of Hormuz, a choke point through which roughly 20% of the world's oil trade passes. That same disruption is landing on Australian forecourts. According to the IBTimes Australia, diesel nationally reached nearly 330 cents per litre this week, with Western Australia recording prices above 366 cents per litre. Analysts warn that meat, fruit, and vegetables could cost 20% more within three weeks as freight operators pass on fuel surcharges.
The Mechanic's Perspective: What You Can Control
When fuel prices spike, most Australians focus on where to find the cheapest litre — but mechanics say the bigger opportunity lies in what you do with every litre you already buy.
"A poorly maintained car can use 15 to 25% more fuel than the same vehicle in good condition," says the consensus among automotive engineers. That gap matters a lot when you're paying over $1.30 per litre more than you were 18 months ago.
Tyre pressure is the simplest and most overlooked factor. Tyres that are underinflated by just 10 PSI increase rolling resistance and fuel consumption by around 3%. A free check at any servo or tyre shop takes two minutes.
Air filters are another low-cost item with outsized impact. A clogged air filter forces the engine to work harder to draw in oxygen, burning more fuel in the process. Replacing a blocked filter can improve fuel economy by up to 10% on older petrol engines. Most manufacturers recommend changing them every 15,000 to 30,000 kilometres, but many Australians push well past that.
Engine oil grade is worth a conversation with your mechanic too. Using the wrong viscosity — or oil that is past its service life — increases internal engine friction and pushes fuel consumption up. Switching to a manufacturer-recommended fully synthetic oil can recover 1 to 3% in economy.
What a Full Service Actually Covers
Many drivers assume a "service" is just an oil change. In practice, a qualified mechanic performing a logbook service will inspect and adjust:
- Spark plugs and ignition timing (worn plugs misfire, wasting fuel)
- Fuel injector condition (dirty injectors reduce atomisation efficiency)
- Oxygen and mass airflow sensors (faulty sensors cause the engine management system to over-fuel)
- Brakes and wheel alignment (drag from sticking callipers or misaligned wheels costs kilometres per tank)
The Australian Competition and Consumer Commission (ACCC) publishes guidelines on vehicle service transparency, and consumers have the right to receive a written quote before work begins. If a mechanic identifies additional faults during a service, they are required to obtain approval before proceeding with repairs.
Driving Habits That Add Up
Mechanics will also point out that technique costs nothing to change. Aggressive acceleration from lights, for example, uses up to 40% more fuel than smooth, gradual acceleration to the same speed. Reducing highway cruising speed from 110 km/h to 100 km/h reduces aerodynamic drag significantly — fuel consumption typically falls by 10 to 15% at that speed differential.
Running the air conditioning at its highest setting increases fuel use by roughly 10%, though modern systems are far more efficient than older units. Pre-cooling the cabin briefly while still parked and then lowering the fan speed is a practical compromise on hot days.
When to Call a Specialist
Some fuel economy losses point to more serious issues: a catalytic converter that is starting to fail, a thermostat stuck open keeping the engine cold, or fuel pressure regulator faults. These won't be resolved by routine servicing and require diagnostic work. If your fuel consumption has increased noticeably without a clear cause, it is worth booking a diagnostic scan before the next road trip. Paying $80 to $150 for an ECU diagnostic check can identify faults that, left uncorrected, might add hundreds of dollars per year in unnecessary fuel spend.
The Irish situation is a sharp reminder that global events can destabilise fuel supply chains faster than governments can respond. The Fuel Security Taskforce convened by the Australian Government is examining longer-term reserve options, but those solutions are measured in months, not weeks. In the meantime, a well-maintained car is the most reliable buffer Australians have against prices that may not normalise quickly.
If you have concerns about your vehicle's fuel efficiency or want a second opinion on a recent quote, find a qualified mechanic near you at Expert Zoom.
This article covers general vehicle maintenance. For advice specific to your make and model, consult a licensed automotive technician.
