Vacaville Gas Check: Regular Fuel Near $5, Diesel at $6.46

Vacaville drivers checking warehouse-club stations were seeing regular gasoline near $5 per gallon on August 1, 2026. Sam’s Club listed regular gas at $5.00 per gallon at its Vacaville station, while Costco’s Vacaville listing showed regular gasoline at $5.099.

Sam’s Club also listed diesel at $6.46 per gallon. These are individual station listings, not an official Vacaville citywide average. Prices can vary by station, membership requirements, payment method, traffic patterns and the time of the check.

Regular gas listings were below the regional benchmark

AAA’s Vallejo-Fairfield metro table listed regular gasoline at an average of $5.503 per gallon on August 1. That was about 50 cents higher than the Sam’s Club listing and roughly 40 cents higher than the Costco listing.

The comparison does not mean every Vacaville station was cheaper than every station elsewhere in the metro area. It shows only that the two cited Vacaville warehouse-club listings were below the broader regional average at the time of the check.

Diesel was listed at $6.46

Sam’s Club listed diesel at $6.46 per gallon in Vacaville. AAA’s Vallejo-Fairfield metro diesel average was $6.762, about 30 cents higher than the cited Sam’s Club price.

Diesel costs matter especially to contractors, delivery operators, farmers, landscapers, service fleets and other businesses that put substantial mileage on trucks and equipment. Higher fuel costs can affect the expense of deliveries, service calls, field work and other vehicle-dependent operations, although the effect on any individual business depends on its fleet, routes and pricing.

What drivers should watch

For commuters and households, regular gas near $5 means small differences between stations can add up over repeated fill-ups. A driver buying 15 gallons would pay about $1.49 more at a station charging $5.099 than at one charging $5.00, before considering any membership or payment conditions.

Fuel-dependent local businesses face a separate calculation because diesel prices are substantially higher than regular gasoline at the cited station. Restaurants, retailers and weekend-travel businesses may also feel indirect pressure if delivery, freight or service costs rise.

The U.S. Energy Information Administration’s California weekly release, published July 28, provides broader statewide gasoline and on-highway diesel context, but statewide data should not be treated as a Vacaville price. Local drivers should compare several stations before filling up because prices can move quickly.

What are you seeing around town? Share the highest and lowest regular-gas or diesel prices you have found in Vacaville.

Sources

• Sam's Club Gas Prices — Vacaville station listing
• Costco Fuel Price — Vacaville station listing
• AAA California Gas Prices — Vallejo-Fairfield metro table
• U.S. Energy Information Administration — California weekly fuel prices