Why You Can Still Get Burned by a Rental Car's Fuel Policy

You return the rental car with a full tank. You have the receipt. You even took a photo of the gas gauge, because someone online told you to. And you still get hit with a fuel charge on your final bill.

It's one of the most complained-about line items in car rental, and unlike a lot of travel gripes, it isn't a myth exaggerated by message boards. Rental companies really do build in ways to collect for gas you didn't use, and the fine print explaining how is written to be skimmed past, not read.

The three choices, and why none of them favor you by default

At the counter, renters are typically offered the same three paths: prepay for a full tank up front, agree to refill it yourself before returning the car, or let the company refill it after you leave and pay whatever price it sets. The Federal Trade Commission lists fuel charges among the standard fees renters should factor into a quote before booking, alongside taxes, airport surcharges and drop-off fees — a sign of how routine the cost surprise has become.

Prepaying sounds like it removes the guesswork, but travel writer Jason Cochran, breaking down the math for Frommer's, calls it a near-guaranteed loser: renters are "pretty much guaranteed not to use precisely" the full tank they paid for, and rental companies keep the leftover gas at your expense, with no refund for fuel you didn't burn. Hertz and Dollar spell that out bluntly on their own sites, warning in capital letters that no refund will be given for unused fuel.

Why "just fill it yourself" isn't foolproof either

Refilling before drop-off is the cheaper option in nearly every case, but it comes with its own trap. Avis and Budget's flat-fee refueling program, marketed as EZFuel, applies automatically if a renter drives fewer than 75 miles — charging roughly $16 to $20 unless the driver returns with a full tank and a fuel receipt in hand. The rule sits in fine print most renters skim past at the counter, and Frommer's has fielded complaints from travelers who returned a full tank and still got hit with the charge, then had to fight it after the fact.

Part of the problem is definitional. A gas gauge reads "full" the moment a pump clicks off, but a car can be driven for miles afterward before the needle moves — and rental agencies rarely top off a car that already looks full before handing it to the next customer. Fill the tank at a discount station near the airport instead of the one right outside it, and you're also dodging the elevated taxes and fees that apply specifically to purchases made at the rental counter itself.

Where the regulatory pushback has actually worked

This isn't a new fight, and it's one regulators have won at least once. More than a decade ago, Maryland's attorney general forced every major rental company operating in the state to cap refueling markups at roughly 140% of the prevailing local gas price, after some firms were charging renters double the pump price or more for company refills. Hertz went further than the state required, extending fairer refueling pricing nationwide rather than confining it to Maryland.

"Car rental companies realize that motorists have had it with gas prices, and they are running out of patience."

Catherine Rossi, AAA Mid-Atlantic, in comments on the Maryland settlement

The FTC separately pursued Budget over fuel charges levied on customers who'd already returned cars with a full tank — a reminder that the fix in any given state or settlement doesn't automatically apply everywhere else, and enforcement has stayed patchy nationally even as individual companies adjust their own policies.

What actually protects you at drop-off

Fuel markups share a common thread with other consumer-fee fights that never quite reach a national resolution — see the long-running, still-unsettled push behind the FTC's "click to cancel" rule, where a fix that sounds simple keeps getting held up in court while the underlying practice continues.

The advice that holds up across every source on this is almost boringly simple: fill up at a station a few minutes from the rental lot, not the one attached to it, and keep the receipt until the final bill is settled. Photographing the fuel gauge, the odometer and the receipt together at drop-off gives you something concrete to point to if a disputed charge shows up later — the same instinct that helps anywhere a company's fee structure runs on fine print a customer can't realistically renegotiate at the counter, whether that's a rental agency's refueling math or the fine print behind why loyalty points can vanish overnight while a gift card legally can't.

None of this requires outsmarting the rental company so much as refusing to skip the ten minutes that protect you: a nearby pump, a saved receipt, and a photo before you hand over the keys. It's a small tax on convenience either way — the only question is whether you pay it in minutes or in dollars, and the fine print is built to make that choice for you if you let it.