The fuel policy on your European car rental can quietly add €50–€150 to your trip cost if you choose the wrong option or don't understand the terms. Rental companies use different fuel policies as both a convenience offering and a profit center. Understanding the differences before you book can save you a surprising amount of money.
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With a full-to-full policy, you receive the car with a full tank and must return it with a full tank. This is the fairest and most transparent option, and it's what you should always aim for when booking.
How it works: The rental company gives you a full tank. You drive, use fuel as needed, and fill up at a petrol station near the return location before dropping the car off. You only pay for the fuel you actually use, at normal petrol station prices.
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With full-to-empty (also called prepaid fuel or fuel purchase option), you pay for a full tank at pickup and return the car at any fuel level — ideally empty. The rental company buys the fuel in bulk and sells it to you at what they claim is a competitive rate.
The only scenario where prepaid fuel makes sense is if you're returning the car very early in the morning when no petrol stations are open, and even then, most airport stations operate 24/7.
This is essentially the same as full-to-full but with slightly different wording in the contract. You receive the car full and return it full. Some companies use this terminology instead — the practical effect is identical.
Some budget rentals give you the car with a partial tank (say, 3/4 full) and ask you to return it at the same level. This sounds fair but creates problems: it's hard to judge exactly 3/4 on a fuel gauge, and if you return it slightly under, you'll be charged for the difference at the rental company's inflated rate.
If offered this option, take photos of the fuel gauge at pickup and return. Better yet, ask if full-to-full is available as an alternative.
Rare in Europe, this means you receive the car nearly empty and return it nearly empty. You buy all your own fuel. This sounds neutral but is inconvenient — you need to find a petrol station immediately after pickup, often while unfamiliar with the area and driving a new car.
Fuel prices in Spain are moderate by European standards (€1.50–€1.70/L for diesel). Motorway service stations charge 10–20% more than town stations. The cheapest fuel is at hypermarket stations (Carrefour, Alcampo).
Italy has some of Europe's highest fuel prices (€1.70–€1.90/L). Self-service pumps (marked "fai da te") are significantly cheaper than full-service. Many Italian stations close for lunch (1–3 PM) and on Sundays, though automated card-payment pumps usually remain available.
Fuel in Greece is expensive (€1.70–€1.85/L) and prices vary significantly between islands and the mainland. Island fuel is typically 10–15% more expensive. Fill up on the mainland when possible.
Fuel prices in Croatia are regulated by the government and change bi-weekly. Prices are uniform across most stations (€1.45–€1.65/L), making it less critical to shop around. INA and Petrol are the main chains.
Unlike North America, diesel cars are extremely common in European rental fleets. Diesel is typically €0.10–€0.20 cheaper per litre than petrol and offers 20–30% better fuel economy. For longer road trips, always check if a diesel option is available — the savings can be substantial over 1,000+ km.
Bookmark this guide and check back before your trip — car rental prices and policies change frequently.
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Data and regulations verified against official sources. Last checked 2026-04-27.
Full-to-full is always the best option. You receive the car with a full tank, drive it, and fill up before returning. You only pay for fuel you actually use at normal petrol station prices, avoiding the markup and waste of prepaid fuel options.
Almost never. Prepaid fuel charges 15-40% more per litre than local petrol stations, and you'll inevitably return some unused fuel that you've already paid for. The only edge case is a very early morning return when nearby stations aren't open — but most airport stations are 24/7.
The rental company will charge you for the missing fuel at their own rate, which is typically 2-3 times the local petrol station price. On top of that, some companies charge a refuelling service fee of 20-40 euros. Always fill up before returning.
Most European airports have petrol stations clearly signed on the approach roads, typically within 2-5km of the terminal. Fill up at these stations rather than in the city to minimize fuel used after your last fill-up. Keep the receipt as proof.
Misfuelling (e.g., putting petrol in a diesel car) is not covered by CDW or any standard rental insurance. Do NOT start the engine — call the rental company immediately. Repair costs can be 1,000-5,000 euros. Always check the fuel type on the rental agreement and fuel flap before filling up.
Fill up at a petrol station within 5 km of the return location. Most European airports have clearly signed fuel stations on the approach road, typically 2-3 km from the terminal. Avoid filling up too far away, as you will burn fuel driving to the drop-off and the gauge may not show full. Keep the receipt with timestamp and location as proof — if the rental company claims you returned it less than full, the receipt is your evidence.
Rental companies charge 2-3 times the local petrol station price for missing fuel, typically 3-5 euros per litre compared to 1.50-2.00 euros at a regular station. On top of that, many companies add a refuelling service fee of 20-40 euros. Returning a half-empty 50-litre tank could cost 100-150 euros in penalties versus 40-50 euros if you had filled up yourself at a nearby station.
As soon as you leave the rental lot, mark the closest petrol station to the return location in your navigation app. Save it as a favourite. On your return day, you will not have to waste time searching for a station while watching the clock. Most major airports have stations within 2 km of the car return entrance.
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Take a clear photo of the fuel gauge at pickup (showing it reads full) and again at return. Include a timestamp. This simple step has saved countless renters from fraudulent fuel charges. If the rental company claims you returned it less than full, the photo and fuel receipt together are powerful evidence for a dispute.
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The prepaid fuel option costs 15-40% more per litre than local stations, and you will always return with unused fuel you have already paid for. Even returning with just one-eighth of a tank left means you are giving back 6-8 litres of fuel worth 10-15 euros for free. The full-to-full policy is cheaper in virtually every scenario.
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