Fuel Policy Guide: Full-to-Full vs Prepaid Explained
Fuel Policy Guide: Full-to-Full vs Prepaid Explained
The fuel policy on your car rental can add EUR 30-100 to your total cost if you choose the wrong option or do not understand the rules. It is one of the most overlooked details when booking, yet one of the easiest places to save money.
Here is a clear breakdown of every fuel policy type, what each costs you, and which to choose.
Full-to-Full (The Best Option)
How it works: You receive the car with a full tank and must return it with a full tank.
Why it is the cheapest:
- You pay market-rate fuel prices at a regular petrol station
- You only pay for the fuel you actually use
- No inflated supplier markups
The only risk: If you forget to refuel before returning, the rental company will charge you for the missing fuel at their rate — typically EUR 2.50-4.00 per litre, which is double or triple the pump price. Some also add a refuelling service fee of EUR 20-40.
Pro tip: Find a petrol station within 5 km of the return location. Fill up, keep the receipt (proof you returned it full), and go straight to the drop-off.
Full-to-Empty (The Worst Deal)
How it works: You buy a full tank at pickup and return the car empty (or with whatever fuel is left — you get no refund for unused fuel).
Why it is expensive:
- The supplier charges their inflated rate for the full tank — often 30-50% above market price
- You can never return the car completely empty, so you always pay for fuel you do not use
- On average, you waste 10-15 litres (EUR 15-25) of paid fuel
When it makes sense: Almost never. The only scenario where full-to-empty is acceptable is an extremely short rental (1 day) where you know you will drive a long distance and use most of the tank.
Prepaid Fuel
How it works: You pay for a full tank at the supplier's rate when you book online. You return the car without refuelling.
The hidden cost: Similar to full-to-empty — the prepaid price per litre is inflated, and you lose money on unused fuel. The convenience of not having to refuel is real, but it costs EUR 25-50 extra on a typical rental.
When it makes sense: If you are catching an early flight and genuinely cannot refuel beforehand, or if the time saving is worth EUR 25-50 to you.
Same-to-Same
How it works: You return the car with the same fuel level as when you picked it up (not necessarily full).
The problem: Subjective. How do you prove the tank was exactly at three-quarters when you picked it up? Disputes are common, and the rental company always wins the argument.
Our advice: Take a clear photo of the fuel gauge at both pickup and return, with a timestamp visible.
Cost Comparison: Real Example
Let us compare a 7-day rental of a VW Golf in Barcelona, driving 800 km:
| Fuel Policy | Fuel Cost | Total Fuel Spend |
|---|---|---|
| Full-to-full | 42 litres at EUR 1.55/L (market) | EUR 65 |
| Full-to-empty | 55 litres at EUR 2.20/L (supplier) + wasted fuel | EUR 121 |
| Prepaid | 55 litres at EUR 2.00/L (online) + wasted fuel | EUR 110 |
Full-to-full saves you EUR 45-56 on this single rental. Over a year of travel, that adds up to hundreds.
Refuelling Tips to Maximise Savings
Finding Cheap Fuel Near Airports
Airport fuel stations are expensive. Prices drop significantly just 2-3 km from the terminal:
- Use Google Maps to search "petrol station" near your return location
- Waze shows real-time fuel prices at nearby stations
- Supermarket fuel stations (Carrefour, Auchan, Tesco, Costco) are consistently 5-10% cheaper
Diesel vs Petrol: Do Not Mix Them Up
Putting the wrong fuel in a car is more common than you think, and it is never covered by insurance:
- Diesel nozzles are typically larger/black in most of Europe
- Petrol nozzles are typically smaller/green in most of Europe (but this varies by country — green is diesel in some countries)
- Always check your key fob or fuel cap for the fuel type
- When in doubt, ask the attendant
Fuel Types by Country Label
| Country | Diesel | Petrol |
|---|---|---|
| Spain | Gasóleo / Diésel | Gasolina |
| France | Gazole / Gasoil | Sans Plomb (SP95/SP98) |
| Italy | Gasolio | Benzina |
| Germany | Diesel | Benzin / Super |
| Portugal | Gasóleo | Gasolina |
| Greece | Dizel / Πετρέλαιο | Βενζίνη / Venzini |
What Happens If You Return Without Enough Fuel?
If you have a full-to-full policy and return the car without a full tank:
- The rental company measures the missing fuel (their estimate, not yours)
- They charge you at their inflated per-litre rate (EUR 2.50-4.00/L)
- Many add a refuelling service fee of EUR 20-40 on top
- The total charge appears on your credit card statement 1-4 weeks later
The Bottom Line
Always choose full-to-full. It is the fairest, cheapest, and most transparent fuel policy. The minor inconvenience of a 5-minute refuelling stop saves you EUR 30-60 per rental.
When you search on World Auto Hire, you can filter results by fuel policy to ensure you only see full-to-full offers.