Walmart Gas Prices in August 2026: Down 0.69% Nationwide, Up 21 Cents Mid-Month
A comprehensive look at pump prices across 1,546 Walmart Supercenter and Neighborhood Market fuel forecourts. Behind a modest 0.69% monthly drop lay a fierce 20-cent mid-month spike, an acute diesel squeeze, and unprecedented regional divergence.
Aug 31 Regular Avg
$3.610
-$0.025 (-0.69%) vs Aug 1
Monthly Peak (Aug 21)
$3.700
+20.7¢ rebound from Aug 11 low
Diesel Month Change
+$0.211
+4.23% (Climbed to $5.194)
Walmart vs. EIA Avg
-46.1¢
EIA National: $4.071 on Aug 31
August 2026 proved to be one of the most volatile months at American fuel pumps in recent history. At first glance, headline figures suggest steady stability: across the 1,546 fuel stations operating at Walmart Supercenters and Neighborhood Markets across 32 states (both Walmart-branded pumps and co-located Murphy USA stations), the national regular unleaded average moved from $3.635 on August 1 to $3.610 on August 31 — a decline of just 2.5 cents (-0.69%).
However, this headline stability completely obscures a month packed with drama: a steep 20.7-cent mid-month price surge, a massive divergence where diesel surged over 4%, dramatic regional crashes in the Midwest, sustained price climbs in the Mountain West, and a staggering $2.18 per gallon single-day spread between individual stations within the exact same retailer.
1. All Fuel Grades: August 1 vs. August 31 Performance
While regular, midgrade, and premium gasoline ended the month slightly lower, diesel rocketed upward as global distillate supply constraints hit refinery output.
| Fuel Grade | Aug 1 | Aug 31 | Change ($) | Change (%) | Aug Avg | Aug High | Aug Low |
|---|---|---|---|---|---|---|---|
| Regular Unleaded | $3.635 | $3.610 | -$0.025 | -0.69% | $3.613 | $3.700 (8/21) | $3.493 (8/11) |
| Midgrade | $4.062 | $4.039 | -$0.023 | -0.57% | $4.043 | $4.130 (8/21) | $3.926 (8/11) |
| Premium | $4.405 | $4.383 | -$0.022 | -0.50% | $4.387 | $4.472 (8/21) | $4.270 (8/11) |
| Diesel | $4.983 | $5.194 | +$0.211 | +4.23% | $5.083 | $5.247 (8/27) | $4.888 (8/11) |
2. Macro Backdrop: Why Did Gas and Diesel Diverge?
To understand the drivers of August 2026 fuel pricing, one must look at the broader energy environment. Throughout August, national retail fuel benchmarks compiled by the U.S. Energy Information Administration (EIA) and AAA reported some of the most expensive pre-Labor Day fuel prices on record:
- Refinery Capacity Constraints: Domestic refineries operated at redline speeds throughout the month, recording capacity utilization between 97.4% and 98.0%. Despite high crude production, aging refinery equipment and scheduled maintenance created a bottleneck. The gross refining margin ("crack spread") between crude oil and refined motor fuels skyrocketed to historic highs exceeding $70 per barrel.
- Global Distillate Squeeze: Continued maritime security concerns in the Strait of Hormuz combined with outages at Eastern European and Russian export facilities severely reduced the global flow of middle distillates. U.S. distillate stockpiles ended August 14% below the five-year seasonal average, forcing diesel prices upward across every single state in the union.
- The Walmart Big-Box Advantage: On August 31, the official EIA national average for regular gasoline stood at $4.071 per gallon. Walmart stations averaged $3.610 — saving customers 46.1 cents per gallon. For a standard 15-gallon fill-up, shopping at Walmart or co-located Murphy stations saved motorists nearly $7.00 per tank compared to commercial street corner stations.
3. The Mid-Month V-Curve: Anatomy of the Rollercoaster
Daily national regular unleaded averages reveal three distinct phases in August 2026:
The 14-Cent Slide
Prices dropped in 9 out of 10 days, drifting from $3.635 down to the monthly trough of $3.493 on Tuesday, August 11, providing brief late-summer optimism.
The 21-Cent Eruption
Crude volatility and Midwest refinery scares sparked a 10-day vertical spike of +20.7 cents, peaking at $3.700 on Friday, August 21. Major single-day jumps occurred on Aug 13 (+9.6¢) and Aug 20 (+7.9¢).
Pre-Labor Day Cooling
After testing retail limits, prices subsided by 1 to 2 cents per day over the remaining 10 days, dropping 9.0 cents to close August at $3.610.
Which Day of the Week Was Cheapest to Fill Up?
Aggregating all 1,546 stations by day of the week exposes a distinct weekly rhythm:
Drivers who scheduled their weekly fill-up on Tuesday saved an average of 6.8 cents per gallon compared to motorists who filled up on Thursday.
4. Regional Breakdown: Midwest Plunge vs. Western Rise
Dividing stations by U.S. Census Bureau regions reveals that the nation did not move in unison:
| Census Region | Stations | Aug 1 Avg | Aug 31 Avg | Net Change ($) | Net Change (%) | Aug Monthly Avg |
|---|---|---|---|---|---|---|
| Midwest | 232 | $3.872 | $3.714 | -$0.158 | -4.08% | $3.797 |
| South | 1,222 | $3.547 | $3.539 | -$0.008 | -0.23% | $3.530 |
| Northeast | 9 | $3.990 | $3.968 | -$0.022 | -0.55% | $3.913 |
| West | 83 | $4.241 | $4.323 | +$0.082 | +1.93% | $4.286 |
The Midwest posted the sharpest price collapse (-4.08%), driven by the resolution of earlier refinery supply scares and intense retail price wars in Indiana and Ohio. In contrast, the West was the only region in the nation to log higher prices at month-end (+1.93%), pushed upward by peak summer tourism in Mountain West states and ongoing regional pipeline maintenance.
5. State-by-State Highlights: Winners & Losers
Looking across individual states, Indiana staged the biggest surprise of the month, dropping 32.4 cents (-9.05%) to overtake Texas as the cheapest state for Walmart fuel in America.
| 1. Indiana (39 stations) | -32.4¢ (-9.05%) |
| 2. Ohio (42 stations) | -25.5¢ (-6.52%) |
| 3. Michigan (26 stations) | -24.0¢ (-5.58%) |
| 4. Illinois (45 stations) | -16.8¢ (-4.01%) |
| 5. Nebraska (3 stations) | -9.0¢ (-2.41%) |
| 6. New Mexico (6 stations) | -8.8¢ (-2.31%) |
| 7. Alabama (78 stations) | -6.4¢ (-1.77%) |
| 8. Georgia (97 stations) | -6.4¢ (-1.75%) |
| 1. Wyoming (2 stations) | +24.0¢ (+6.45%) |
| 2. Idaho (13 stations) | +24.0¢ (+5.76%) |
| 3. West Virginia (11 stations) | +12.4¢ (+3.44%) |
| 4. Utah (23 stations) | +12.6¢ (+3.09%) |
| 5. Montana (1 station) | +12.0¢ (+2.82%) |
| 6. Washington (4 stations) | +8.5¢ (+1.86%) |
| 7. Colorado (9 stations) | +4.6¢ (+1.17%) |
| 8. Florida (125 stations) | +4.0¢ (+1.08%) |
Cheapest States on August 31Regular avg
- 1. Indiana$3.258
- 2. Texas (350 stations)$3.442
- 3. Mississippi$3.466
- 4. Louisiana$3.473
- 5. Tennessee$3.490
- 6. South Carolina$3.492
- 7. Oklahoma$3.532
- 8. Kentucky$3.549
Most Expensive States on August 31Regular avg
- 1. California (13 stations)$5.028
- 2. Washington$4.664
- 3. Idaho$4.407
- 4. Montana$4.379
- 5. Arizona$4.203
- 6. Utah$4.203
- 7. Michigan$4.058
- 8. Illinois$4.020
6. City & Station Level Records: The $2.18 Single-Day Chasm
On August 31, the distance between the cheapest and most expensive station in the Walmart network was an astounding $2.18 per gallon.
The Nation's Cheapest Walmart Stations ($3.079 – $3.129)
Indiana and Greater Houston dominated the bargain rankings at month-end:
The Nation's Priciest Stations ($4.999 – $5.259)
California forecourts carried heavy state taxes and boutique fuel production costs:
Most Volatile Individual Locations
- The Biggest Plummet: Walmart Supercenter #2350 in Wauseon, Ohio plunged a remarkable 65.0 cents ($3.969 down to $3.319). Lafayette, IN (#3851) dropped 57.0 cents, and Indianapolis Beech Grove (#5443) dropped 54.0 cents.
- The Biggest Spike: Walmart Supercenter #1393 in Oskaloosa, Iowa surged +44.0 cents ($3.389 up to $3.829), while Ottumwa, Iowa (#1285) jumped +39.0 cents.
- The Dallas-Fort Worth Micro-Spike: Across the DFW metro area (Lake Worth, Hurst, Burleson, Crowley, Fort Worth), multiple Walmart and Murphy stations experienced aggressive price cycling spikes of +36 to +39 cents mid-month.
7. Operator Comparison: Murphy USA vs. Walmart-Branded Pumps
Walmart fuel centers are operated either as co-located Murphy USA stations or as Walmart-branded fuel forecourts:
Murphy USA at Walmart
$3.580 Aug 31 avg
-$0.046 (-1.27%) month change
August Monthly Average: $3.599 • Diesel Aug 31: $5.192
Walmart-Branded Pumps
$3.681 Aug 31 avg
+$0.024 (+0.66%) month change
August Monthly Average: $3.648 • Diesel Aug 31: $5.201
Murphy USA co-located forecourts passed along deeper discounts to consumers throughout August, ending the month 10.1 cents cheaper than Walmart-branded stations on average.
8. Consumer Playbook: How Drivers Can Save in September
Shift Fill-Ups to Early in the Week
With Thursdays and Fridays averaging nearly 7 cents more per gallon, filling up on Monday evening or Tuesday morning yields an easy $1.00+ saving on every standard tank.
Exploit State-Border Price Spreads
Commuters crossing state lines can achieve dramatic savings. A driver crossing from eastern Illinois (averaging $4.020) into western Indiana (averaging $3.258) can save up to 76 cents per gallon ($11.40 per 15-gallon tank) simply by planning their pit stop.
Anticipate the September 15 Winter-Blend Switch
Under EPA clean-air rules, the mandate to sell costly summer-blend gasoline officially expires on September 15. Refineries will transition to cheaper winter-blend formulas that utilize low-cost butane. As winter fuel reaches terminal racks in late September and October, motorists can expect retail gas prices to ease by 15 to 25 cents per gallon, barring new international crude disruptions.
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