Deciding between a petrol or diesel car is one of the biggest choices you’ll make as a used car buyer. Both fuel types have distinct strengths and limitations, and the right choice depends on how you drive, how often you travel and what you need your vehicle to do. Whether you’re navigating city streets, heading to regional destinations or towing loads, understanding the differences between petrol and diesel will help you make a smart and confident decision.
At Premier Autos, we help buyers just like you weigh up the pros and cons every day. This clear, down-to-earth guide breaks down everything you need to know about petrol and diesel — from running costs and performance to real-world driving needs — so you can choose the right car for your lifestyle and budget.
Petrol cars are powered by spark-ignition engines that burn petrol mixed with air to create power. These engines are commonly found in everyday passenger cars, hatchbacks, sedans and many SUVs. Petrol engines tend to run smoothly and quietly, making them a great choice for daily urban or suburban driving.
If most of your driving is local — like school runs, shopping trips or commuting to work — petrol cars are often the easier and more cost-effective option in everyday situations.
Diesel cars use compression-ignition engines that burn diesel fuel. These engines are designed to deliver high torque at lower revs, which is why they’re often found in larger SUVs, utes and vehicles used for towing or long-distance travel.
Diesel cars are often chosen by drivers who regularly undertake interstate travel, spend lots of time on the freeway, or need extra strength for towing trailers, campers or caravans.
Choosing between petrol and diesel isn’t just about the price of fuel — total running costs include fuel economy, servicing and repairs, insurance and resale value. Here’s how they compare:
If your driving mainly involves short trips or urban travel, petrol’s lower servicing costs and smooth performance may outweigh diesel’s fuel economy advantage. However, if you regularly travel long distances or require heavy-duty performance, diesel’s efficiency can offer significant savings over time.
Another key consideration is how the car feels on the road. Petrol engines typically deliver smooth, responsive acceleration, especially at lower speeds — a quality many drivers appreciate in urban and suburban settings. Diesel engines, on the other hand, produce robust torque at lower RPMs, which can feel more powerful and confident when overtaking, climbing hills or towing heavy loads.
Your choice might come down to preference: if you value quieter, lighter performance in town, petrol engines often deliver a more refined feel. If strength, load-carrying ability and highway economy matter most, diesel’s performance characteristics are hard to beat.
Both petrol and diesel engines produce emissions, but they differ in type. Petrol engines typically generate higher levels of carbon dioxide (CO₂), whereas older diesel engines can emit more nitrogen oxides (NOₓ) and particulates. Modern vehicles from both fuel types now include advanced emission-control systems that significantly reduce environmental impact compared with older models.
If environmental concerns are important to you, focus on newer vehicles with up-to-date emission control technology and sound servicing history — these factors often matter more than fuel type alone.
There isn’t a one-size-fits-all answer, but the following general guidelines can help:
Understanding your driving habits — including how often you drive, how far you travel and whether you tow — will help you decide which fuel type suits you best.
Choosing between petrol and diesel is an important step in the car-buying process. With the right information and a clear understanding of your driving needs, you can find a vehicle that matches your lifestyle, running costs and long-term priorities.
Ready to browse quality petrol and diesel used cars? Explore the current range at Premier Autos and take the next step with confidence.