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Car Hire Fuel Policy Explained: Full-to-Full vs Pre-Purchase
Car hire fuel policies confuse everyone. Full-to-full, full-to-empty, pre-purchase — which saves money and which traps you? Straight answers with real costs.
Fuel policy is the most complained-about part of car hire. Not the car. Not the insurance. Not the queue at the desk. The fuel. Because no matter how carefully you read the terms, the car hire fuel policy rarely matches what actually happens when you return the vehicle.
At ReviewCarHire, fuel disputes appear in roughly one in five reviews. Customers feel overcharged, confused, or caught out by policies they did not fully understand when they signed. This guide strips it down to what matters.
The three fuel policies explained
There are three main approaches. Every supplier uses one or a variation. Know which you are signing before you drive away.
Full-to-full
You collect the car with a full tank. You return it with a full tank. If you do, there is no fuel charge.
The catch: If you return it less than full, the supplier charges you to refill — usually at a premium rate (€2.50–3.50 per litre vs the local pump price of €1.60–2.00). They may also add an admin fee of €20–40.
Why it is still the best policy: Because you control the cost. Fill up at a station near the airport, keep the receipt, and you pay nothing extra.
Review note: A customer at Barcelona Airport said: "Returned with three-quarters full because I misjudged the distance. Europcar charged me €87 for the missing quarter tank. Should have filled up at the station 5 minutes from the airport."
Full-to-empty (or "return empty")
You collect the car with a full tank. You return it as empty as you dare. You have already paid for the full tank upfront, usually at a premium rate.
The catch: You pay for a full tank whether you use it or not. If you return it half full, you have effectively paid double the pump price for the fuel you used. The supplier pockets the difference.
When it suits you: Rarely. Only if you are certain you will use nearly the entire tank and you value the convenience of not refuelling before return.
Review note: A traveller at Malaga Airport reported: "Paid €95 for a full tank upfront. Drove to Granada and back, used half. Gave them €47 worth of fuel for free. Never again."
Pre-purchase with refund
You pay for a full tank upfront but get refunded for unused fuel. Sounds fair. It rarely is.
The catch: The refund is based on the supplier's calculation, not the gauge. Admin fees are deducted. Some suppliers refund only whole litres, not partial. And the refund can take weeks.
Review note: A renter at Lisbon Airport said: "Pre-purchased fuel, used two-thirds. They refunded me for the unused third — minus a €25 admin fee and minus 'pump service charge'. Got back €12 on a €65 tank. Scam."
Which suppliers use which policy?
| Supplier | Default policy | Notes |
|---|---|---|
| Hertz | Full-to-full | Standard on most rentals |
| Avis | Full-to-full | Occasionally offers pre-purchase at booking |
| Sixt | Full-to-full | Pre-purchase sometimes pushed at desk |
| Enterprise | Full-to-full | Rarely deviates |
| Europcar | Mixed | Depends on country and booking channel |
| Goldcar | Full-to-empty or pre-purchase | Frequently complained about in reviews |
| Green Motion | Pre-purchase with refund | Refund process often criticised |
Major brands like Hertz, Avis, and Enterprise almost always use full-to-full. The problems come with low-cost brokers and some local suppliers who default to full-to-empty or pre-purchase.
How to avoid fuel charge disputes
1. Photograph the fuel gauge at pickup and return Timestamped photo evidence is your best defence if a supplier claims you returned short.
2. Keep the final fuel receipt If you refuel before return, keep the receipt for at least two weeks. Some suppliers ask for it if they query the level.
3. Refuel close to the return point Do not fill up 50 km away and then drive to the airport. The gauge drops. Fill at the nearest station to the return location.
4. Check the policy before you sign At the desk, ask explicitly: "Is this full-to-full?" If they say anything else, decide whether you accept it or want to change supplier.
5. Use a fuel finder app Apps like GasBuddy or local equivalents show the cheapest station near the airport. Saving €0.30 per litre on a 50-litre tank is €15 — worth the two-minute detour.
What fuel type should you use?
Most rental cars in Europe run on petrol (gasoline) or diesel. The type is marked on the key fob, a sticker inside the fuel flap, or the rental agreement.
The cost of getting it wrong:
- Putting petrol in a diesel car: €500–2,000 in damage
- Putting diesel in a petrol car: €300–1,000
- Neither is covered by standard insurance
How to avoid it:
- Check the fuel type before you leave the car park
- Take a photo of the fuel flap sticker
- If unsure, ask the desk staff to confirm
In some countries (Spain, Portugal, France), E10 petrol (10% ethanol) is standard. Most modern rentals handle it fine. Older vehicles might not. Check the manual if you are unsure.
Electric and hybrid rentals: the new fuel question
Electric vehicles (EVs) are increasingly available in rental fleets, especially in Norway, the Netherlands, and Germany.
Charging policy: Most suppliers require you to return the EV with at least 70–80% charge. Some include a charging cable, some do not. Some expect you to use public chargers, some have partnerships with charging networks.
Cost: Charging at public stations varies (€0.35–0.70 per kWh). A full charge for a medium EV is roughly €20–40 and gives 300–450 km range.
Review note: A renter in Oslo said: "Picked up a VW ID.3. No charging cable in the car, had to buy one at a petrol station for €35. Supplier said it should have been there. Next time I will check before leaving the car park."
For now, EV rentals are still a niche. Petrol and diesel dominate most fleets.
FAQ
What is the best fuel policy for car hire?
Full-to-full is almost always the best. You only pay for what you use, at pump price, with no admin fees.
What happens if I return the car without a full tank?
The supplier charges you to refill at a premium rate, often €2.50–3.50 per litre, plus an admin fee of €20–40.
Is pre-purchase fuel ever worth it?
Rarely. Only if you are certain you will use the entire tank and you value the convenience of not refuelling before return. Even then, you usually pay above pump price.
Can I change the fuel policy at the desk?
Sometimes. If the booking defaults to full-to-empty, ask for full-to-full. The desk may refuse if the system is locked. Booking direct with the supplier gives more flexibility than brokers.
Do I need to keep my fuel receipt?
Yes. Keep the final fuel receipt for at least two weeks. Some suppliers request it if they dispute the return level.
What if the fuel gauge is inaccurate?
Take a photo at pickup and return. If the gauge seems wrong, mention it to the desk before you drive away. Document everything.
How do I know what fuel type the car takes?
Check the key fob, the sticker inside the fuel flap, or the rental agreement. If unsure, ask before leaving the car park.
Do suppliers charge a premium for refuelling?
Yes. The premium is usually €0.80–1.50 per litre above the local pump price, plus a fixed admin fee.