The Costco gas station guide 2026 covers one of the most consistently underappreciated member benefits in the entire Costco ecosystem — a benefit that millions of members use every week without fully understanding the quality advantage, the pricing architecture, and the stacking opportunity that makes the Costco gas station genuinely more valuable than its line-avoidance reputation suggests. Costco fuel stations consistently offer prices $0.20 to $0.40 per gallon below nearby