If you've ever driven past a Costco gas station and seen a long line of cars, you probably wondered: is the wait really worth it? The short answer is yes — Costco consistently undercuts name-brand competitors by 10 to 30 cents per gallon, and in some regions the gap is even wider. Over the course of a year, that adds up to real money. This page breaks down exactly how Costco gas prices compare to other major stations, why Costco can charge less, and how much you can expect to save.
Costco isn't running a loss leader on gasoline. The low prices are a direct result of Costco's high-volume, low-overhead membership business model. Here's why Costco can charge less than almost anyone else:
The table below shows typical price differences between Costco and major brand-name stations. These ranges are based on general patterns observed across the United States. Actual prices vary daily and by region, so treat these as guidelines rather than guarantees.
| Station Type | Avg Price vs Costco | Annual Savings (12,000 mi, 25 mpg) |
|---|---|---|
| Costco | Baseline | — |
| Shell | +15 to 25¢/gal | $72–$120/year |
| Chevron | +20 to 30¢/gal | $96–$144/year |
| BP | +15 to 25¢/gal | $72–$120/year |
| Mobil | +20 to 30¢/gal | $96–$144/year |
| Unbranded / local | +5 to 15¢/gal | $24–$72/year |
Note: These are typical ranges, not exact prices. Gas prices change daily and vary significantly by region. Use tools like GasBuddy or AAA to check current local prices.
Costco diesel fuel — available at over 70 warehouse locations — follows the same pricing pattern as regular gasoline. If you drive a diesel truck, tow a fifth-wheel, or run a diesel RV, the per-gallon savings at Costco can be even more significant since diesel prices tend to be more volatile than regular gas. Want to learn more about Costco diesel specifically? Check out our comparison of Costco diesel vs Shell diesel and our deep dive on Costco diesel fuel quality.
We deliberately don't list daily gas prices on this page because they change constantly — sometimes multiple times per day at the same station. Here's what we recommend instead:
Here's a quick calculation. Say the average driver puts 12,000 miles on their car per year at 25 mpg — that's 480 gallons of gas annually. If Costco averages 20 cents per gallon cheaper than the nearest name-brand alternative, that's $96 per year in gas savings alone. A Costco Gold Star membership costs $65 per year, so the gas savings more than covers the membership fee — before you buy a single thing inside the warehouse.
Executive members ($130/year) earn 2% cashback on most purchases, including gas. If you spend $1,500/year on gas at Costco, that's $30 back — plus the per-gallon savings. For a detailed breakdown, see our guide to the Costco membership gas discount.
Costco's price advantage isn't uniform across the country. In states with high gas taxes and strict fuel blend requirements — particularly California and Washington — the gap between Costco and name-brand stations tends to be larger, sometimes exceeding 30 to 40 cents per gallon. In states with already-low gas prices and heavy competition, the gap may be narrower.
Even in regions where the savings are smaller, Costco is rarely the most expensive option. The membership model and high-volume operations keep prices competitive regardless of the local market.
Costco gas is consistently among the cheapest fuel you can buy in North America. The savings come from a business model that doesn't rely on gas-pump profit, not from cutting corners on fuel quality. For most drivers who live near a Costco with a gas station, the annual savings will easily cover the cost of membership — and then some. Ready to find your nearest Costco fuel station? Search our interactive map or browse our frequently asked questions for more tips.
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Disclaimer: CostcoDiesel.com is an independent website and is not affiliated with, endorsed by, or sponsored by Costco Wholesale Corporation. "Costco" is a registered trademark of Costco Wholesale Corporation. Gas prices shown on this page are illustrative ranges based on publicly available data and are not guaranteed.