Costco White Marsh Gas Price (2025)

FAQs

Is Costco Premium gas 91 or 93? ›

A: Regular and ​p​remium ​gasoline, and ​d​iesel at select locations. Gasoline ​octane can vary by state, but at Costco, it's typically 87 octane for Regular and 91 octane for Premium Gasoline.

On its website, you can read the following in the Costco Fuel Q&A section: “The fuel station is open to Costco members only. There is an exception: Costco Shop Card customers do not need to be Costco members.” So, all you need is access to Costco Shop Cards, and you will be pumping cheaper gas in no time.

Costco Gasoline

Launch the app and tap the Warehouse icon at the bottom of the screen. Tap the pin of the warehouse you want to view gas prices at. You will be taken to the Warehouse details page. View the warehouse's hours and current gas prices.

The fact that gas is cheaper at Costco doesn't mean it's lower in quality. The company offers Kirkland Signature gasoline, which is formulated to improve vehicle performance and fuel economy. Costco says the gas also reduces emissions, making it better for the environment.

In this way, combustion is carried out in a much smoother and more efficient way. This means that premium 93 octane gas has a higher performance. In addition, it is also very likely that fuel consumption will be lower than if we use 87 or 91 octane gasoline.

Costco is listed as a TOP TIER™ gasoline retailer. Find out more at www.toptiergas.com. Kirkland Signature™ Gasoline contains five times the EPA detergent requirement in both regular unleaded and premium grades, and is formulated to clean your engine and help your vehicle run like new.

Don't try to use someone else's membership card

Your membership card is a special thing. Each card is "not transferable," per Costco's rules, meaning that only you can use it.

Buy Gas on Monday or Tuesday

Be strategic about the days you fill up at the pump. “For gas, Mondays and Tuesdays tend to be the cheapest days to fill up your tank as demand is lower at the beginning of the week,” Anderson said.

The Costco membership card is non-transferable, but there are several ways to share the experience with family and friends. Anyone with a card can bring up to two guests to the Warehouse during each visit. Keep in mind that purchasing items is exclusive to Costco members.

You'll know you're filling up with the good stuff if you spot a small green sticker on the pump that says “TOP TIER Detergent Gasoline.” As of early 2022, the following stations sold Top Tier gasoline in the U.S.: 76, ARCO, Aloha, Beacon, Breakaway, CITGO, Cenex, Chevron, Conoco, Costco Wholesale, CountryMark, ...

Where does Costco gas come from? ›

Where does Costco gasoline come from? The gasoline from you local Cosco comes from the same terminal as the rest of your local gas stations. The only difference is that is doesn't get the proprietary additive package added to it that you pay extra for from Shell or Chevron or whatever your local options are.

THE ANSWER

Yes, it is worth getting a wholesale membership to save on gas prices.

“You save approximately 20 cents a gallon at Costco over other local vendors,” says David Schwartz, who together with his wife Susan authored “The Joy of Costco”. “That's something we have seen time and time again across the country.”

The short answer is that unlike pretty much every other retail business that sells gasoline, Costco doesn't care about making money from its gas pumps. In fact, Costco typically sells its gas at a moderate loss. Why would Costco do this? It's not an act of charity.

The octane level of regular Gas is usually 87 in most states. On the other hand, premium gas is usually 91 or 93 octane. If the fuel is more powerful, it can withstand more compression before it explodes. The higher the octane rating, the less likely the detonation will happen at the wrong time.

Premium gas is also often called high-octane gas thanks to its octane rating of 91 to 94. Regular gas typically has an 87 rating, while the 88-90 range is considered midgrade. Premium gas drives performance in specific engines, but the idea that it's more fuel efficient is a myth.

Synergy Supreme+ premium gas generally has an octane level of 93, but may be blended and sold at an octane level of 91 or 92 in certain areas of the US. So what are some of the benefits of premium gas with a high octane level? Octane ratings are a measure of fuel stability.

What products do you sell? Regular Unleaded (95 octane), Premium Unleaded (97 octane) and Premium Diesel.