Why Costco, Sam's Club typically have lower gas prices than other stations

(NEXSTAR) — When your gas tank is nearing empty, you may opt for a gas station where you can redeem rewards, or at least one with the best snacks. Or maybe, you're driving to your nearest Costco and Sam's Club for the slightly cheaper prices at the pump. But how can those warehouses keep their prices so much lower than your other favorite fueling spots? How much do Coloradans spend on groceries? Report says less than most states It's...