Caravan Fuel Consumption Australia: How Much Fuel Does Towing a Caravan Use?

Australia has one of the highest rates of caravan ownership in the world — over 600,000 registered caravans hit the road each year, from weekend escapes on the coast to multi-month grey nomad circuits of the continent. And for every one of those caravans, the biggest variable cost is fuel.

The problem is that most published fuel economy figures are for vehicles without a trailer attached. Once you hitch up a caravan, fuel consumption can increase by 20–40% or more. This guide gives you the real-world numbers, explains why towing burns so much more fuel, and shows you exactly how to calculate and reduce your own towing fuel cost.

How Much Does Towing a Caravan Actually Increase Fuel Use?

The short answer: expect 20–35% more fuel for a typical Australian van-style caravan weighing 1,500–2,200 kg, towed at 90–110 km/h on sealed roads.

Here are typical real-world towing fuel consumption figures for common Australian tow vehicles:

Figures are real-world estimates from owner reports and caravan club data. Your results will vary with caravan type, weight, towing speed, and terrain.

Want to calculate your exact towing fuel cost? Try our Towing Fuel Cost Calculator — enter your vehicle's normal L/100km, select your trailer type, and it applies the appropriate fuel penalty to show you total trip cost.

Why Does Towing a Caravan Use So Much More Fuel?

1. Aerodynamic Drag (the biggest factor)

At highway speeds, aerodynamic drag is the dominant reason towing is so expensive in fuel. A caravan presents a large, flat frontal area — often 2.5–3 square metres — compared to the tapered rear of the tow vehicle. This creates a massive wall of air resistance at speed.

Critically, aerodynamic drag increases with the squareof speed. Going from 90 to 110 km/h doesn't just add a little more drag — it multiplies it significantly. This is why speed management is the single most powerful tool for cutting towing fuel costs, which we'll cover below.

2. Rolling Resistance

A typical twin-axle caravan adds four extra tyres to the road, each contributing friction. Combined, this rolling resistance is significant, particularly at lower speeds or on rough roads. Proper tyre inflation on both the tow vehicle and caravan is essential — a tyre 10 PSI under-inflated can increase rolling resistance by 5–10%.

3. Weight and Inertia

The combined weight of vehicle and caravan can reach 5,000–7,000 kg for a large rig. This weight matters most during acceleration (every time you accelerate from a stop or overtake) and on uphill grades. Flat terrain minimises the weight penalty; hilly routes in the Great Dividing Range, Tasmanian highlands, or the Snowy Mountains can dramatically increase towing fuel use.

The Biggest Factor: Speed

Speed deserves its own section because the impact is so large and so immediately actionable. Here is what real-world caravanners consistently find:

• 110 km/h towing: 16–19 L/100km (typical for a 2,000 kg caravan behind a diesel ute)
• 100 km/h towing: 13–16 L/100km — saving 2–3 L/100km
• 90 km/h towing: 11–14 L/100km — saving a further 2–3 L/100km

The difference between 110 and 90 km/h on a 2,000 km trip (say, Sydney to Cairns one way) can easily be $100–$150 in fuel — and you only add an hour or two to the total drive time. Most speed-limited caravanning states have a maximum tow speed of 100 km/h or less anyway.

Diesel vs Petrol for Caravan Towing in Australia

The diesel vs petrol debate is a live one in Australian caravanning, but the practical reality for long-distance towing heavily favours diesel for most setups:

• Torque curve: Diesel engines produce peak torque at 1,500–2,500 RPM, ideal for sustained highway towing. Petrol engines often need to rev higher to produce equivalent torque, burning more fuel in the process.
• Energy density: Diesel contains approximately 38 MJ/L vs 34 MJ/L for petrol — roughly 12% more energy per litre. This partly explains lower L/100km figures for diesel despite similar-sized engines.
• Towing range: Diesel 4WDs typically travel 600–900 km per tank when towing, versus 400–600 km for petrol equivalents. In remote Australia where fuel stops are 200–400 km apart, range matters.

That said, petrol vehicles are not impractical. Many Australian families successfully tour with petrol-powered SUVs towing caravans up to 2,000 kg. The fuel cost is higher, but purchase and maintenance costs are often lower, and petrol availability is better at smaller regional outlets.

How to Calculate Your Caravan Towing Fuel Cost

The formula is straightforward:

Example: Toyota HiLux normally uses 9 L/100km. Towing a 2,000 kg caravan at 25% penalty = 9 × 1.25 = 11.25 L/100km. For a 1,200 km trip at $1.92/L: (11.25 ÷ 100) × 1,200 × $1.92 = $259.20 in fuel.

For an instant calculation with different trailer types and custom penalty inputs, use our Towing Fuel Cost Calculator.

8 Proven Ways to Reduce Caravan Towing Fuel Costs

1. Slow down. As covered above, reducing highway speed from 110 to 90–100 km/h can save 2–5 L/100km. This is the biggest single lever. Many states legally require caravans to stay under 100 km/h anyway.
2. Check tyre pressures before every long trip.Both the tow vehicle and caravan tyres should be at the manufacturer's recommended towing pressure (often higher than everyday driving pressures). Correct pressures reduce rolling resistance and improve stability.
3. Reduce caravan load. Every 100 kg removed from the caravan reduces fuel use, particularly on hilly routes. Audit what you actually use on trips — water tanks, spare gear, and heavy recreational equipment add up quickly.
4. Use cruise control on flat roads only. On undulating or hilly terrain, cruise control can cause aggressive downshifting on uphills. Let the vehicle slow slightly on steep climbs and recover speed on descents rather than maintaining constant speed at all costs.
5. Fit a weight distribution hitch. Distributing the tow ball weight across the front axle improves aerodynamics and vehicle attitude, with a modest fuel benefit in addition to improved handling.
6. Service your vehicle before the trip. Fresh engine oil reduces internal friction. A clean air filter improves intake efficiency. Worn spark plugs (petrol) or injectors (diesel) reduce combustion efficiency. A pre-trip service pays for itself on a 3,000 km caravanning holiday.
7. Adjust tow ball download.Having the tow ball weight within the manufacturer's recommended range (typically 8–12% of the trailer ATM) optimises the aerodynamic profile of the combination and reduces suspension loading.
8. Plan fuel stops strategically. Regional fuel prices in Australia vary significantly. Filling up in major towns before remote stretches, and using apps like MotorMouth or GasBuddy, can save $0.10–$0.30/L compared to highway servos. On a 150-litre fill, that is $15–$45 saved from smart fuel timing alone.

Towing Fuel Cost for Popular Australian Road Trips

Using a baseline of 13 L/100km towing consumption (diesel 4WD, 2,000 kg caravan, 100 km/h) and $1.95/L:

Estimates based on 13 L/100km towing consumption at $1.95/L. Actual costs will vary with vehicle, caravan weight, speed, and fuel prices along the route.

For a round trip, double the one-way fuel cost and add 10–15% for detours, hill sections, and fuel price variations. Use our Towing Fuel Cost Calculator to enter your specific vehicle consumption and fuel price for a personalised estimate.

What About Camper Trailers and Boat Trailers?

Not all towing is caravan towing. Lighter trailers have smaller fuel penalties:

• Camper trailer (750–1,500 kg): typically 15–22% fuel penalty. Camper trailers sit lower and are more aerodynamic than van caravans, reducing drag at speed.
• Boat on trailer (500–1,200 kg): 12–18% penalty. Boats are narrower than caravans but can catch significant side-wind, particularly on exposed coastal routes.
• Box/utility trailer (<500 kg): 5–12% penalty. The fuel impact of a light empty trailer is relatively minor.

For boat towing specifically, our Boat Fuel Calculator handles on-water fuel planning once you're at your destination.

Planning Your Caravan Trip Fuel Budget

For a realistic caravan trip fuel budget, we recommend a three-step approach:

1. Calculate your expected towing fuel cost using the Towing Fuel Cost Calculator with your real consumption figures (use a recent trip or fill-up record rather than the manufacturer's rated figures).
2. Add a 15% buffer for fuel price variation, headwind days, unexpected detours, and any steep terrain not accounted for in your baseline estimate.
3. Check regional fuel prices for your route before you leave using MotorMouth or FuelWatch (WA), and identify the cheapest fuel stops along the way.

Frequently Asked Questions