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5 June 2026 · SunnVio

Rental car fuel policy: full-to-full explained

The fuel policy is one of the most underrated costs when you rent a car. Pick the wrong option and you can easily overpay by tens of euros – without getting anything back. In this guide we explain the different policies and show why full-to-full is almost always the cheapest choice.

What a fuel policy actually is

The fuel policy – sometimes called the tank policy – sets out how you receive and return the car in terms of fuel. It's always in your rental terms, but often only becomes clear at the counter. There are roughly two types: full-to-full and full-to-empty (sometimes called prepaid). The difference looks small, but it can add up to tens of euros on a single trip. So find out which policy applies to your booking before you travel, and you won't be caught out at pick-up.

Full-to-full: almost always the best choice

With full-to-full you get the car with a full tank and return it full. You only pay for the fuel you actually use, at the normal pump price. This is the fairest and usually the cheapest policy, because you don't pay anything up front and you don't waste fuel you'll never use. Top up just before you return the car and the gauge will match, so there's nothing to explain. For most holidaymakers this is the option to look for.

Full-to-empty or prepaid: why it often costs more

With full-to-empty – pick up full, return empty – you pay for the whole tank in advance, often at a rate higher than the pump. The catch: any fuel you don't use, you don't get back. Almost nobody manages to run the tank down to the last drop, so in practice you pay for air. It can only work out on very long trips where you genuinely return the car (nearly) empty, and that's a gamble. Always do the maths and check whether full-to-full is cheaper.

How to refuel smartly just before return

Plan your last fill-up at a station near the drop-off point, for example close to the airport. Keep in mind that pumps right next to an airport are sometimes pricier; a station a few kilometres away can save you money. Returning the car somewhere other than where you picked it up? Then read our tips on returning a rental car at a different location, as that can change your route and your last chance to refuel. Fill the tank right up so the needle sits at maximum when you hand back the keys.

Keep your receipt and avoid disputes

Always keep the receipt of your last fill-up, with the date, time and location. If the rental company later claims the tank wasn't full, you have instant proof. It also helps to photograph the fuel gauge just before you return the car. These small checks are part of a stress-free return, just like properly checking the car for damage at pick-up. Want to protect yourself against other surprise costs too? Our explainer on the rental car excess will help. Not sure which policy applies to your booking? Request a free quote and we'll set out the fuel policy clearly in advance.

Frequently asked questions about the fuel policy

What does full-to-full mean for a rental car?

You receive the car with a full tank and return it just as full. You only pay for the fuel you use along the way, at the normal pump price. It's the most transparent policy and usually the cheapest too.

Is full-to-empty ever cheaper than full-to-full?

Rarely. You pay for the whole tank up front, often above pump price, and you don't get unused fuel back. It can only pay off if you run the tank almost completely empty, but in practice full-to-empty usually means you overpay.

What happens if I don't return the tank completely full?

The rental company refuels it themselves and charges you for the fuel plus, often, a service fee, at a rate above pump price. So refuel just before return and keep the receipt as proof.