"Fueling Up: Costco vs. Sam's Club - The Ultimate Gas Showdown"

When it comes to the quality of gas, there is a notable difference between Costco and Sam's Club. Costco offers Top Tier fuel, which is designed to reduce deposit buildup and improve engine performance, while Sam's Club does not. Top Tier fuel keeps engines cleaner and can result in better fuel economy. While Top Tier gas may cost more, filling up at warehouse stores like Costco and Sam's Club can still save you money overall, as their gas prices are typically cheaper than regular gas stations.