Costco has seen unprecedented demand for gas as prices surged above $4 nationwide and $6 on the West Coast.
The retailer undercuts local gas stations by around 30 cents a gallon by relying on membership fees for profit.
About half of customers who fill up at Costco gas stations end up shopping in the warehouse.
AI-generated summary was reviewed by a CNN editor.
In its 50-year history, Costco has never seen such demand for gas.














