Costco says Americans are panic-buying one thing again—and it’s not toilet paper

With gas prices soaring, Americans looking to save at the pump are flocking to Costco in droves. In its latest quarterly earnings report, the budget-friendly retailer described a “record-breaking” volume of sales in its gasoline business. Costco operates its own pumps attached to its retail locations, which members who pay $65 annually can use to fill up.  Like the food and goods inside Costco warehouses, the company’s fuel prices aggressively undercut the competition—good business sense a...