Costco’s Secret Growth Engine May Be Running Out of Gas

Costco's comparable sales growth faces a headwind as gasoline prices normalize from their May peaks, threatening the tailwind that has propped up recent performance. The retailer uses fuel as a loss-leader to drive member traffic, but that strategy delivers less lift as prices retreat from highs.

The stock has dropped over 10% from its $1,096 all-time high, yet still commands a 46x forward earnings multiple—a premium valuation that raises questions about sustainability. Analysts are divided on whether the recent member additions will translate into durable revenue or represent a temporary spike tied to gas price volatility.

Costco has leaned heavily on its fuel business to attract shoppers, but elevated prices at the pump created an unusual amplification effect on traffic and sales. As that effect fades, the core business must prove it can justify the valuation without the gas tailwind.

June sales figures and September earnings will provide the first clear read on whether Costco can maintain momentum. The company needs to demonstrate that new members are sticky and that merchandise sales can carry growth independent of fuel price swings.