Costco Gas Foster City (2025)

FAQs

Is it worth driving to Costco for gas? ›

The data shows that Costco's prices aren't typically the absolute cheapest, but they're always significantly less expensive than the "average" price. This means you're more than likely getting a deal when you get gas from Costco versus another random gas station in your city.

Insider Tips: When to Visit to Avoid the Crowds

Plan your fueling around the quieter times, typically during the middle of the week and early in the morning. Additionally, members can consult the Costco app, which sometimes offers real-time updates on gas station wait times.

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.

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.

Most reports seem to indicate that Costco gas tends to be about $0.20 less on average than traditional gas stations in the same area, although there are reports that estimate the savings at nearly double this amount. To be conservative with the analysis, we'll use $0.20 per gallon in savings.

Price check

Costco Gas Stations offer consistently low, member-exclusive prices. With the Costco app, you can check Costco gas prices on your phone. On the app, find your local warehouse to see hours of operation, gas prices and more warehouse details.

Costco is listed as a TOP TIER™ gasoline retailer. Find out more at www.toptiergas.com.

Buy Gas on Monday or Tuesday

“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.

In general, gas prices tend to be lowest at the beginning of the week, on Monday and Tuesday, GasBuddy's lead petroleum analyst Patrick De Haan told Nexstar. As the week goes on, gas prices tend to rise until they reach their most expensive point on the weekend – especially on Friday and Saturday.

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.

Does 91 to 93 octane make a difference? ›

The lower energy and greater resistance to burning of the higher octane lowers the detonation. There is not a big difference, especially in a modern car.

Regardless though, AAA estimates that most Americans will fill up their tank anywhere between 45 and 55 times a year on average. So, yes, we can VERIFY that it is worth getting a wholesale membership to save on gas prices.

But Costco's prices are consistently recognized as the lowest in the industry, according to fuel price tracking app GasBuddy.

Deposit control additives

Our Kirkland Signature Fuels include additives designed to minimise engine deposits that are harmful to a vehicle's performance and emissions. All Costco fuels contain deposit control additives that have been tested and are proven to have positive effects on your vehicle's engine performance.

Ventura County Citizens Against Mega Gas filed the lawsuit this spring, challenging the city's approval of the Costco. The group is made up of Camarillo and county residents who sued after the City Council denied their appeal on the project in February, allowing the members-only store to move forward with its plans.

The takeaway: Costco gas is cheaper for members

However, if you'd have to go out of your way to get to a Costco and you shudder at the prospect of waiting in extremely long lines for marginally cheaper gas, then the savings simply might not be worth it for you.

Average driver in the USA uses 562 gallons of gas each year. Average Costco gas price is ~20 cents cheaper per gallon in the USA (it's often reported to be up to 60 cents per gallon cheaper in some states like California!!)

Costco gas is offered at a great price

Although the exact amount of savings you'll get varies based on your location and the specific club you're shopping at, you'll typically save around $0.20 per gallon at Costco according to most online reports. Most cars hold between 10.5 and 18.5 gallons of gas.

So why is it so much cheaper than the competition? 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.