Filling up in Portugal is about to sting a little more if you run a diesel. From Monday, the price of standard diesel is forecast to climb 4.5 cents a litre, taking the average to roughly €2.189, according to predictions from the Automóvel Club de Portugal. Petrol drivers get the opposite: 95-octane petrol is expected to drop 1.5 cents to about €2.10 a litre.
On a practical level, that means a 50-litre diesel tank costs an extra €2.25 from next week, while the same petrol fill-up should be around 75 cents cheaper. Small numbers on paper, but they add up on a long road trip — and they land in the middle of a much steeper climb.
The forecasts, based on international fuel prices and exchange rates, could still shift with Friday's market close or any tweak to Portugal's fuel tax (ISP). The bigger picture is the real story: since the latest conflict in the Middle East began disrupting energy supplies, diesel has racked up a rise of 51.8 cents a litre and petrol 40.7 cents, per ECO — before next week's changes are even counted.
It's got political attention too. Prime Minister Luís Montenegro recently called the price surge "senseless", urging international action and warning that costs are squeezing both households and businesses. For now, though, drivers can only watch the pump.
If you're hiring a car or touring Portugal by road, the takeaway is simple: diesel no longer enjoys its old price edge over petrol, and the gap has flipped. When booking, a petrol engine may now be the slightly cheaper bet, and comparing fuel prices between stations — apps like Preços dos Combustíveis list them officially — can save real money over a couple of weeks. Plan longer drives on motorways with a full tank where you can, and factor fuel into your daily budget rather than treating it as an afterthought.
This is one for anyone planning a self-drive holiday in Portugal right now — whether that's the Douro Valley by car, the Alentejo backroads, or the classic coastal run down to the Algarve.
