Sixt Fuel Policy 2026: Refueling Fees Explained
Sixt is a German rental brand that has expanded aggressively in the US. Its standard fuel policy is full-to-full. If the car comes back below full, Sixt's help center says it charges the actual cost of fuel plus a service fee, and that the total is usually well above gas-station prices. Travelers report totals that work out to roughly $11 to $12.50 per gallon, about three times a $3.65 pump price, but Sixt does not publish a fixed per-gallon rate.
Sixt's fuel options
Sixt presents these fuel options at the counter, sometimes pre-selected during online booking:
| Option | What it means | Cost if not used perfectly |
|---|---|---|
| Return full (default) | Get the car full, return it full. You fuel up yourself. | Reported ~$11.00-$12.50/gal if below full (varies by location) |
| Prepaid Fuel Option | Prepay for one full tank at pickup at near-retail rates. | $1-$16 of unused fuel you paid for |
The math: real-world numbers
A BMW 3 Series rental with a 15.8-gallon tank, returned half-empty, at a typical 2026 US gas price of $3.65/gallon. The refueling rate below is a typical reported figure, not an official Sixt price; your agreement shows the actual rate.
7.9 gal of unused fuel lost (the half tank you return) = $28.04 wasted
Sixt parent company: Sixt SE (Germany)
Sixt has no US sister brands. Internationally Sixt operates in more than 100 countries, where fuel is charged per liter. Sixt vehicles tend to be premium models (BMW, Mercedes) with larger tanks, so refueling charges hit harder if you forget to fill up.
Renting an EV from Sixt?
Sixt's full-to-full policy covers electric cars too: its help center says you receive the battery full and should return it full. If it is not full, Sixt charges for the electricity at cost plus a service fee. The Prepaid Fuel option covers a full tank or battery, and unused fuel or electricity is not refunded.
How to avoid Sixt's refueling fee
- Photograph the fuel gauge at pickup. Critical proof of starting fuel level.
- Decline PPO unless your situation specifically requires it (very short rental, returning empty).
- Find a gas station 3-5 miles from the return location. Airport-adjacent stations charge 20-50¢ more per gallon.
- Keep the gas receipt - required evidence in any dispute.
- Photograph the fuel gauge after filling, with timestamp.
- Wait for a return receipt that shows fuel level as full before leaving the lot.
Frequently asked questions
How much does Sixt charge for refueling?
Sixt does not publish a fixed nationwide per-gallon refueling rate. Travelers report about $11.00 to $12.50 per gallon, roughly 3.0 to 3.4 times a $3.65 pump price. On a 15.8-gallon tank returned half-empty, that is approximately $87 to $99. The rate varies by location, so check your rental agreement.
What is the Sixt Prepaid Fuel Option?
PPO lets you prepay for one full tank at pickup at near-retail prices. No refueling charge regardless of return level, but no refund for unused fuel.
Does Sixt Plus / Sixt Diamond affect fuel charges?
No. Sixt Plus / Sixt Diamond loyalty does not waive refueling service charges or discount the Prepaid Fuel Option.
Can I dispute a Sixt refueling charge?
Yes. Photograph the fuel gauge at pickup and after filling, keep your gas receipt. Dispute in writing within 30 days. If unresolved, file a credit card chargeback within 60 days.
What's the cheapest way to handle fuel with Sixt?
Return-full with self-fill 5-10 minutes from the return lot is usually cheapest. FillItRight calculates the exact gallons to add so you don't over- or under-fill.
Do Sixt's fuel rates differ at airport vs. off-airport locations?
They can. Refueling rates are set by location, and airport locations often charge more than neighborhood branches. The fuel policy structure is the same; check the per-gallon rate on your agreement.