Toll motorway or free road: when is it worth paying?

The short answer

• If there’s a free dual carriageway (autovía) running alongside on a similar route, the toll is rarely worth it: fuel use is the same, and only the difference in distance and time counts.
• Compared with a single-carriageway road, the motorway uses about €2.84 more fuel per 100 km. It pays off if the toll plus that difference seems a fair price for the time you save.
• Motorways run by the Spanish state company SEITT (such as the R-2, R-3, R-5, AP-36 and AP-41) are free every day from midnight to 6 am.
• If you use a state toll motorway regularly, ask about the discounts for frequent users.

Fuel: the motorway uses more, not less

It’s common to assume the motorway saves fuel because there are no bends, junctions or towns. You do drive at a steadier pace, but at 110–120 km/h (68–75 mph) air resistance weighs far more than at 70–90 km/h (43–56 mph), and that cancels out the advantage. We explain it in our guide to fuel consumption at 100, 110, 120 and 130 km/h.

In the calculator, the petrol hatchback from our guides (6.0 L/100 km WLTP) uses about 7.9 L/100 km in real-world motorway driving, 6.1 on country roads and 7.7 in town. Speed limits also make a difference: for cars in Spain, 120 km/h on motorways and 90 km/h on single-carriageway roads (General Traffic Regulations, art. 48).

An example: 100 km by motorway or by country road

We compare the same 100 km trip by motorway and by a single-carriageway road that passes through a few villages. It’s an example, not a real route: your distances and average speeds will differ.

Now we add the toll to the fuel difference and spread it over the time saved:

For a sense of real prices: in 2026 a car pays €8.80 between A Coruña and Santiago on the AP-9 and €7.55 between Santiago and Pontevedra (Audasa tariffs). In 2026, tolls on Spain’s state concession motorways rose by 3.64–4.68%, and those run by SEITT by 2%.

If the free alternative is a dual carriageway that takes a longer way round, the sum is simpler: every extra kilometre is paid for in fuel. With 15 extra km, about €1.99 and 8 minutes. If the toll costs well over that, take the free road, unless those minutes matter to you.

Safety and comfort

Money isn’t everything. According to Spain’s traffic authority (DGT), 1,119 people died on roads outside built-up areas in 2025: 821 on single-carriageway roads (73%) and 298 on motorways and dual carriageways. That isn’t a rate per kilometre driven, and there are far more kilometres of single-carriageway road, but motorways separate the two directions of traffic and have no level junctions or overtaking into oncoming traffic.

On a long trip, a faster, less tiring route also counts, especially if you’re driving at night or with children.

Tips

• Before choosing, compare the free and toll routes in kilometres and minutes. If the difference is small, the toll is rarely worth it.
• On the motorway you don’t have to do 120: at 110 km/h you save fuel and lose barely 5 minutes per 100 km.
• If you can set off in the early hours, SEITT motorways are free from midnight to 6 am.
• If you use it daily, ask about frequent-user discounts. With a Vía-T tag you don’t have to stop and, on the AP-9, discounts only apply if the system reads the tag.
• To compare the cost of both routes, use the calculator: it splits the distance between town, country roads and motorway and gives you the fuel cost of each option. Tolls are extra.

Frequently asked questions