Full-to-full fuel policy in Spain

Fuel policy sounds like fine print until it costs you real money at the return desk. The good news: there is exactly one fair policy — full-to-full — and the only skill involved is a ten-minute stop on your last day. Here is how it works and where the traps are.

What does full-to-full actually mean?

Full-to-full means the car is handed over with a full tank and comes back with a full tank. You pay for exactly the fuel you burned, at normal pump prices, at a station of your choice. There is nothing to calculate and nothing for anyone to profit from — which is precisely why some suppliers push the alternatives so hard.

Hybrids behave exactly like petrol cars for policy purposes. Electric rentals swap the tank rule for a charge rule — typically returning the car above a stated minimum charge — so read the contract line if you booked an EV.

Why are prepaid fuel and half-tank schemes a worse deal?

"Prepaid fuel" (full-to-empty) charges you for the entire tank up front, typically above pump price and often with a service fee, and refunds nothing for what you bring back — return the car half full and you have donated half a tank. "Same-to-same" schemes, where you return it at whatever level you got it, invite disputes about gauge photos. The pitch at the desk is convenience: "no need to find a station before your flight". That convenience is real, and it costs roughly the difference between a full tank at inflated prices and the fuel you actually use. On a one-week rental where you'd return the car nearly full anyway, it is an expensive way to save ten minutes.

What do you need to do at pickup and at return?

Your job at pickup takes thirty seconds: check the gauge is actually full before you drive off, and photograph it along with the odometer. If it is a notch down, tell the desk or the car-park attendant immediately so it is noted — otherwise you will pay to correct someone else's shortfall at return.

Your job at return is the famous last stop. Suppliers generally expect the car refuelled close to the return point — think within about ten kilometres — and some ask to see the receipt, so refuel on the final approach, not at your hotel two hours earlier. Keep the receipt and take one more photo of the gauge in the return car park. Around Málaga Airport this is easy: there are several stations within a few minutes of the terminal, and the Repsol on the A-7 just before the airport exit is the classic last stop, open around the clock. Add fifteen minutes to your airport timing and the whole thing is stress-free.

How do Spanish petrol stations work?

The details differ from home. Petrol is gasolina 95 (labelled E5 or E10); diesel is gasóleo A, labelled B7 — and a large share of rental cars here are diesel, so check the sticker inside the fuel flap and the contract before you lift a nozzle. Most stations are self-service, you pay at the kiosk or at the pump, and at night many switch to a service window where you prepay. Attendant service still exists at some stations; a small tip is appreciated but never required.

One small money note: motorway service stations price fuel noticeably higher than supermarket and town stations, so on longer stints it pays to fill up where locals do. Any fuel-price app — or simply the price totems by the road — makes the comparison effortless, and over two weeks of driving the difference buys a good dinner.

What if the wrong fuel goes in — and which mistakes should you avoid?

If the wrong fuel goes in anyway: do not start the engine. Starting is what circulates the mistake through the system and turns a drainable annoyance into an engine claim that no standard cover pays for. Call the supplier's assistance line and follow their instructions.

Mistakes to avoid: accepting prepaid fuel "just to be safe" on a short rental you will finish nearly full; refuelling an hour from the airport and topping up nothing on arrival — gauges are coarse, and a long final leg can drop a bar; losing the receipt that would have settled the argument; and putting gasolina in a gasóleo car at kilometre one of the holiday. Full-to-full plus one planned stop beats every clever alternative, every time.