Costco is rolling out a set of stricter measures at its fuel centers aimed at shutting down a long-running workaround: non-members borrowing or sharing a membership card to buy cheap gas. The warehouse giant is instructing fuel attendants to watch for the practice, deploying digital tracking on card usage, and warning that violators risk having their memberships revoked entirely.
The crackdown targets what amounts to a simple hustle. A Costco member swipes a card at one pump, then passes it to a friend or family member at the next pump over. Both fill up at Costco's members-only price, often well below what competing stations charge, but only one of them actually pays for the privilege of membership.
For Costco, the math is straightforward. Membership fees are the backbone of the company's business model. Every non-member who fills a tank on someone else's card is a free rider, enjoying a benefit without contributing to the system that makes it possible. The U.S. Sun reported on the company's updated enforcement approach, which layers several tools on top of one another to make card-sharing harder to pull off.
The first line of defense is human. Costco is actively instructing its fuel station attendants to watch for the telltale signs of card-sharing, a card being handed from one driver to another, or the same card appearing at multiple pumps within a short window.
Behind the scenes, a digital layer backs up the attendants. Costco's system now tracks when a single membership card is scanned across several gas pumps or in rapid succession. That kind of activity can trigger an account review, putting the member on notice that something irregular has been flagged.
At certain warehouses with stricter rules, attendants may go a step further and visually verify that the name on the membership card matches the person standing at the pump. The fuel pump itself already requires an active membership card to unlock, but the added human check makes it harder to game the process with a borrowed card.
The ultimate consequence is membership revocation. Costco reserves the right to cancel a member's account for policy violations, and card-sharing at the fuel center now appears squarely in the company's crosshairs.
Costco gas is often much cheaper than what standard gas stations charge. That price gap is the whole reason the card-sharing trick exists. For families already stretched thin by surging household costs, the temptation to let a friend or relative borrow a membership card for a fill-up is real.
But Costco's fuel pricing depends on volume and on the membership fees that subsidize the operation. If the company lets card-sharing slide, it erodes the value proposition for paying members and undermines the closed-loop economics that keep those pump prices low in the first place.
The retail membership model only works when the gate stays shut. That principle is why Costco has always required a membership card to enter its warehouses and why it checks cards at checkout. Extending the same rigor to its fuel centers is a logical step, one that arguably should have come sooner.
There is, however, one legitimate path for non-members to buy Costco gas: the Costco Shop Card. A member can purchase a Shop Card and give it to someone who does not hold a membership. That card can be used at the fuel pump without triggering the membership verification process.
It is unclear whether this workaround applies at every Costco fuel center or only at select locations. But the distinction matters. The Shop Card route means the member has already spent real money, effectively pre-paying for the non-member's access. That is a transaction Costco can track and profit from, unlike a quietly passed membership card that generates no additional revenue.
For consumers watching every dollar, and with auto-related expenses hitting record levels, the Shop Card option at least preserves a legal way to share the savings. The difference is that Costco gets its cut.
Costco's move fits a pattern across the warehouse-club sector. Membership-based retailers are tightening the screws on sharing and freeloading as competition intensifies. Sam's Club has been investing heavily in technology to sharpen its own competitive edge against Costco, and both chains have reason to protect the exclusivity that makes their membership fees worth paying.
The enforcement also arrives at a moment when consumers face pressure from multiple directions. State and local tax increases, including what taxpayer advocates in California have called the largest tax hike in state history, squeeze disposable income further and make every discount feel more urgent.
None of that changes the basic principle at work. Costco sells memberships. Members get access to lower prices. Non-members do not. Enforcing that boundary is not punitive. It is the deal.
Several questions remain unanswered. Costco has not publicly disclosed when the new enforcement measures took effect or which specific regions are piloting the strictest protocols. No official press release or policy statement has surfaced. It is also unclear whether the company has revoked any memberships specifically for fuel-center card-sharing, or how many accounts have been flagged by the digital tracking system.
The sourcing behind the claim that attendants are receiving new instructions, whether it comes from an internal memo, employee accounts, or a company spokesperson, has not been specified. As previously reported, the broader crackdown on card-sharing has been building for some time, but the operational details remain thin.
What is clear is the direction. Costco is moving to close a gap between its stated policy and its actual enforcement at the pump. For paying members, that should be welcome news. For the friend who has been borrowing your card every other Tuesday, the free ride appears to be ending.
Private businesses have every right to enforce the terms their customers agreed to. Costco members pay for access. Non-members do not. When the company finally enforces that line at the gas pump, the only people with a complaint are the ones who were never entitled to be there in the first place.
