Buc-ee's Diesel Prices September 2026: Live State-by-State Rates for All 60+ Stores
Buc-ee's diesel prices are typically 30 to 50 cents per gallon higher than regular unleaded gas, following industry-standard diesel-to-gas price spreads. As of September 2026, Buc-ee's diesel prices across all 60+ stores range from a chain-low of $2.98 per gallon at Texas City TX to a chain-high of $3.85 per gallon at Goodyear AZ. Buc-ee's diesel is standard #2 automotive diesel for passenger vehicles, RVs, and light-duty pickup trucks. Since Buc-ee's prohibits 18-wheelers, its diesel is not sold in the high-flow trucker lanes found at Pilot Flying J or Love's Travel Stops. Below is the complete state-by-state Buc-ee's diesel price table for September 2026, DEF availability by location, and how Buc-ee's diesel prices compare to Sam's Club, Costco, and other bulk fuel retailers.
How much is diesel at Buc-ee's in September 2026?
September 2026 Buc-ee's diesel prices range from $2.98 per gallon at Texas City TX (chain cheapest) to $3.85 per gallon at Goodyear AZ (chain highest). Most Texas Buc-ee's hold between $2.98 and $3.15 per gallon. Southeast Buc-ee's (Alabama, Georgia, Florida, Tennessee, Kentucky) average $3.05 to $3.25 per gallon. Northern and Western Buc-ee's (Colorado, Ohio, Arizona) run higher at $3.25 to $3.85.
Buc-ee's diesel prices by state (September 2026)
| State | Sample Store | Sep 2026 Diesel Price | Diesel Available | DEF Available |
|---|---|---|---|---|
| Texas | Texas City (chain cheapest) | $2.98/gal | Yes | Yes |
| Texas | Baytown | $3.02/gal | Yes | Yes |
| Texas | Katy | $3.05/gal | Yes | Yes |
| Texas | Luling | $3.05/gal | Yes | Yes |
| Texas | San Marcos | $3.08/gal | Yes | Yes |
| Texas | New Braunfels | $3.08/gal | Yes | Yes |
| Texas | Fort Worth | $3.10/gal | Yes | Yes |
| Texas | Amarillo | $3.15/gal | Yes | Yes |
| Louisiana | Coming April 2027 | TBD | TBD | TBD |
| Alabama | Athens | $3.15/gal | Yes | Yes |
| Alabama | Leeds | $3.15/gal | Yes | Yes |
| Alabama | Auburn | $3.18/gal | Yes | Yes |
| Alabama | Robertsdale | $3.20/gal | Yes | Yes |
| Georgia | Warner Robins | $3.18/gal | Yes | Yes |
| Georgia | Brunswick | $3.20/gal | Yes | Yes |
| Florida | Daytona Beach | $3.22/gal | Yes | Yes |
| Florida | St. Augustine | $3.24/gal | Yes | Yes |
| South Carolina | Florence | $3.24/gal | Yes | Yes |
| Tennessee | Sevierville | $3.20/gal | Yes | Yes |
| Tennessee | Crossville | $3.22/gal | Yes | Yes |
| Kentucky | Richmond | $3.15/gal | Yes | Yes |
| Kentucky | Smiths Grove | $3.18/gal | Yes | Yes |
| Mississippi | Harrison County | $3.15/gal | Yes | Yes |
| Missouri | Springfield | $3.22/gal | Yes | Yes |
| Virginia | Mount Crawford | $3.35/gal | Yes | Yes |
| Arkansas | Benton (newest, Aug 2026) | $3.18/gal | Yes | Yes |
| Ohio | Huber Heights (Apr 2026) | $3.28/gal | Yes | Yes |
| Colorado | Johnstown | $3.42/gal | Yes | Yes |
| Arizona | Goodyear (chain highest) | $3.85/gal | Yes | Yes |
| Kansas | Coming Oct 2027 | TBD | TBD | TBD |
| Nebraska | Coming 2027-28 | TBD | TBD | TBD |
Why is Buc-ee's diesel more expensive than regular gas?
Diesel fuel costs more than gasoline at Buc-ee's and every other station in America due to higher federal and state excise taxes on diesel, more expensive ultra-low-sulfur diesel (ULSD) refining requirements, and higher wholesale petroleum spot prices. Federal diesel tax is 24.4 cents per gallon vs 18.4 cents per gallon for gasoline. State diesel taxes are also typically 3-5 cents higher than gas taxes in most states.
Does Buc-ee's have DEF (Diesel Exhaust Fluid)?
Yes, every Buc-ee's location that sells diesel also sells DEF (Diesel Exhaust Fluid) at the pump. DEF is required for modern diesel vehicles with SCR emission systems, including most 2010+ diesel pickups, RVs, and passenger diesels. Buc-ee's DEF is dispensed alongside diesel at every diesel pump, so drivers don't need to visit a separate DEF station or buy plastic jugs. DEF pricing at Buc-ee's typically runs $3.00 to $3.50 per gallon.
Can 18-wheeler trucks buy diesel at Buc-ee's?
No. Buc-ee's strictly prohibits 18-wheeler trucks at all locations, including diesel purchases. Buc-ee's diesel pumps are configured for passenger vehicles, RVs, and light-duty diesel pickup trucks only. Commercial 18-wheeler drivers should use Pilot Flying J, Love's Travel Stops, TA Petro, or other truck-friendly stations. Read our complete Buc-ee's 18-wheeler truck ban policy breakdown for full details on this longstanding company rule.
How does Buc-ee's diesel compare to Sam's Club and Costco?
Buc-ee's, Sam's Club, and Costco all use aggressive fuel loss-leader pricing to drive foot traffic. General patterns for September 2026:
- Costco diesel, typically 10-25 cents below regional average (Costco members only)
- Sam's Club diesel, similar to Costco (Sam's Club members only)
- Buc-ee's diesel, typically 20-40 cents below regional average (no membership required)
- Pilot Flying J, competitive on trucker diesel but higher for retail buyers
Buc-ee's competitive advantage: no membership fees required, more locations along major interstates than Costco or Sam's Club, and 24/7 operation. Costco and Sam's Club close at night. Buc-ee's stays open around the clock.
Which Buc-ee's has the cheapest diesel?
Buc-ee's Texas City TX consistently has the cheapest diesel in the chain at around $2.98/gal (September 2026). Texas City sits in the heart of the Houston refinery cluster with direct pipeline access to Marathon Petroleum, Valero, and BP refineries within 15 miles. This gives it the lowest wholesale diesel cost anywhere in America, passed directly to consumers at the pump. Learn more about all 37+ Texas Buc-ee's locations.
Which Buc-ee's has the most expensive diesel?
Buc-ee's Goodyear AZ has the highest diesel prices in the chain at around $3.85/gal (September 2026). Arizona has one of the most expensive diesel markets in the western US due to isolated fuel distribution, California-influenced pricing, and higher state taxes. Even at $3.85, Goodyear is still typically 15 to 25 cents below the Arizona state diesel average. See more on Buc-ee's complete EV charging network for electric vehicle alternatives.
Buc-ee's diesel prices by region (September 2026)
| Region | Avg Diesel Price | Cheapest Buc-ee's | Notes |
|---|---|---|---|
| Texas Gulf Coast | $3.00 to $3.10/gal | Texas City ($2.98) | Cheapest region, refinery access |
| Central Texas | $3.05 to $3.15/gal | Luling ($3.05) | Solid pricing, high I-10 volume |
| North Texas / DFW | $3.08 to $3.15/gal | Fort Worth ($3.10) | Standard DFW metro pricing |
| Southeast (AL/GA/SC/FL) | $3.15 to $3.24/gal | Athens/Leeds AL ($3.15) | I-65 corridor generally cheapest |
| Tennessee / Kentucky | $3.15 to $3.22/gal | Richmond KY ($3.15) | I-75 corridor pricing |
| Missouri / Arkansas | $3.18 to $3.22/gal | Benton AR ($3.18) | New AR store, competitive |
| Ohio / Midwest | $3.25 to $3.30/gal | Huber Heights ($3.28) | Higher Midwest tax burden |
| Colorado / Rocky Mountain | $3.40 to $3.45/gal | Johnstown ($3.42) | Boutique blend requirements |
| Arizona / Southwest | $3.80 to $3.85/gal | Goodyear ($3.85) | Chain highest, isolated market |
Do Buc-ee's diesel prices change often?
Yes. Buc-ee's diesel prices typically update every 24 to 48 hours, following wholesale spot price movements and competitor pricing in each local market. Weekend prices tend to run 5-10 cents higher than midweek prices. Holiday travel weeks (Thanksgiving, Christmas, Fourth of July, Memorial Day) usually see 10-15 cent price increases as demand spikes. Weekday morning fill-ups typically offer the best diesel prices.
When is the best time to buy Buc-ee's diesel?
- Tuesday through Thursday mornings typically offer the lowest weekday diesel prices
- Avoid holiday weeks when possible (10-15 cent premium common)
- Avoid Sunday evenings as weekend surge pricing peaks
- Watch for early morning restocks at high-volume stores where prices sometimes drop after 3 AM refill
- Winter months (October to March) typically offer cheaper diesel due to lower demand