If Gas Prices Stay High, Costco Stock Could Be a Better Buy Than Walmart

Costco is outperforming Walmart in 2026 and appears better positioned if elevated gasoline prices persist. Walmart said fuel-center customers are buying less than 10 gallons per visit, the lowest since 2022, while Costco reported record-breaking gasoline volumes and its top five volume weeks ever in the latest quarter. The article argues Costco's gas business may also drive higher warehouse spending, supporting relative upside versus Walmart amid inflationary pressure from the Iran-related oil spike.

Analysis

The immediate takeaway is not simply that Costco is a better defensive retailer; it is that higher fuel prices are acting like a tax on low- and middle-income households while simultaneously reinforcing Costco’s membership value proposition. That creates a bifurcation: Walmart is exposed to the margin squeeze on the consumer side, while Costco converts fuel traffic into higher basket size and stickier renewal behavior. The second-order effect is that Costco’s gas business is less of a standalone profit center and more of a traffic acquisition channel, which can amplify warehouse productivity over the next 1-3 quarters if fuel remains elevated.

The market may be underestimating how quickly a sustained oil shock can pressure Walmart’s discretionary mix even if top-line traffic holds initially. The risk is not an immediate sales collapse, but a gradual degradation in ticket quality as consumers optimize for essentials and delay bigger baskets; that usually shows up with a lag of several months. If gasoline remains tight through summer driving season, the easiest relative trade is not just COST/WMT outperformance, but a broader rotation toward retailers with high-income customer bases and away from names levered to stretched household budgets.

The contrarian angle is that Costco’s multiple already embeds a premium for quality, so the setup is better as a relative-value trade than a naked long. If oil retraces quickly on any de-escalation in the Iran conflict, the incremental benefit to Costco’s gas-traffic thesis fades, while the valuation gap remains. In that case, Walmart’s downside may be less severe than the headline suggests because the stock already discounts a slower consumer, whereas Costco needs the fuel-driven volume story to justify continued multiple support.

Key Decisions for Investors

• Long COST / short WMT pair trade for 4-12 weeks; express the view that fuel-led traffic and basket lift will continue to favor Costco while Walmart’s lower-income mix faces delayed pressure. Stop if oil reverses sharply and COST/WMT relative performance breaks above recent highs.
• Buy COST on pullbacks only, targeting entries after any 2-3% post-rally consolidation; upside is driven by continued warehouse cross-shop conversion, but the risk/reward is poor chasing at peak multiple compression tolerance.
• Sell WMT upside calls or run a cautious call spread overwrite into the next earnings cycle; the risk is a slow grind lower in estimates rather than a crash, making short-vol premium attractive if realized volatility stays contained.
• If crude remains elevated for 2-3 months, rotate part of retail exposure into higher-income discretionary platforms and away from mass-market staples/discount retail; the consumer strain typically emerges with a lag, not instantly.