Toll road vs free route: which costs less?

Short answer: is the toll road worth it?

A toll road may be worth using when the toll fee is no greater than the fuel it saves plus the value you place on the time it saves. A free route is cheaper when its extra fuel cost is still below the toll. There is no fixed national answer because distance, traffic, toll class, direction, fuel use and time saved all change by trip. The cash-and-time comparison does not override road safety, access or reliability.

Compare both routes on the same basis

Input	Toll route	Free route
Distance	Road-route kilometres	Road-route kilometres
Travel time	Minutes checked in the same short time window	Minutes checked in the same short time window
Fuel cost	Distance ÷ 100 × L/100km × $/L	Distance ÷ 100 × L/100km × $/L
Toll fee	Current fee for vehicle class and direction	$0
Cash cost	Fuel cost plus toll fee	Fuel cost

Toll-route cash cost = toll-route fuel cost + toll fee. Free-route cash cost = free-route fuel cost. Keep time separate until both cash totals are known.

Calculate the fuel difference

Route fuel cost = distance in kilometres divided by 100, multiplied by the vehicle's L/100km, multiplied by the fuel price in dollars per litre.

Use the same vehicle and a current local price for both routes. If traffic or stop-start driving changes your real fuel use materially, replace the brochure figure with a measured figure from a comparable trip.

Worked example: cash cost and time

This is illustrative arithmetic, not a current toll quote. Assume the toll route is 28km and 30 minutes with a $7.20 toll. The free route is 36km and 45 minutes. The vehicle uses 8.0L/100km and fuel costs $2.00/L.

Route	Fuel cost	Toll	Cash total
Toll route	$4.48	$7.20	$11.68
Free route	$5.76	$0	$5.76

The toll route costs $5.92 more in cash and saves 15 minutes. The break-even time value is $5.92 divided by 0.25 hours, or $23.68 per hour. On these assumptions, the toll route becomes worthwhile only when the driver values those 15 minutes above $5.92 and the time estimate is reliable.

Use the FuelRadar route planner

1. Enter the start, destination, fuel grade, vehicle efficiency and expected fill size.
2. To compare the choices, run the route twice. First leave Avoid tolls off and note the route distance, duration and any toll-road section detected.
3. Switch on Avoid tolls and run the route again. Note the new distance, duration and any toll section still detected.
4. Calculate both route fuel costs from distance using the same L/100km and same fuel price.
5. Get the current monetary toll from the relevant government or operator calculator, add it to the toll-route fuel cost, then compare both cash totals and the time difference.

The planner's displayed trip fuel estimate can use the recommended station's reported price and its return detour. Treat that as a whole route and recommended-stop scenario, not an isolated toll-versus-free fuel comparison. For the toll decision alone, use each route distance with the same vehicle efficiency and fuel price.

FuelRadar asks the routing provider to avoid toll roads where possible. Avoidance is a preference, so check the reported toll sections in the returned route. FuelRadar does not calculate the monetary toll fee.

Check the current toll fee

For Sydney, the Service NSW motorway toll calculator provides a one-way trip fee and warns that the return direction can cost a different amount. For Melbourne, Transport Victoria lists CityLink, EastLink and the West Gate Tunnel and links to the relevant operators. For Queensland, Transport and Main Roads lists the current toll-road network and payment provider. The Linkt toll calculator covers its Sydney and Brisbane routes.

Check direction, vehicle class and return travel

A return trip is not always twice the one-way toll. Direction, entry and exit points, distance, vehicle class, and the pass or account used can change the amount. Calculate each direction separately when the government or operator calculator says charges differ.

Put a value on the time saved

First calculate the extra cash cost of the toll route. Then divide that amount by the hours saved. The result is the hourly value needed to justify the toll. Use a value that reflects the actual trip. Fifteen minutes before a fixed appointment is different from fifteen minutes on an unhurried drive.

What the comparison does not include

FuelRadar's route estimate does not include the monetary toll, parking, vehicle wear, a traffic guarantee or the driver's value of time. Reported station prices can also change. Confirm the route, toll and final bowser price before leaving.

Sources and limits

Toll-network and fee-checking guidance was checked against Service NSW, Transport Victoria, Queensland Transport and Main Roads, and Linkt. The worked example is FuelRadar arithmetic and does not quote a live route or fee. Sources checked 26 August 2026.