Costco Gas Station offers the best gas prices and quality gasoline. Membership based fuel centers sell Top Tier rated fuel and Kirkland Signature™ Gasoline formulated to clean your engine and help your vehicle run like new. Prices are consistently lower than other stations and the lines move quickly thanks to self-serve setup. Lines are rarely long but may be long; lines move quickly and the hoses make it easy to fill the tank. Customers generally good service and can take a photo of the price for a great deal. The cash back on gas with a Citi Visa credit card is great.