What the current benchmarks show
AAA reported a national diesel average of $6.4839 per gallon on September 26, down from $6.5019 the day before but slightly below $6.4866 one week earlier and above $3.6890 one year earlier. AAA lists the September 22 value of $6.5276 as its highest recorded diesel average.
The U.S. Energy Information Administration reported a national on-highway diesel price of $6.529 per gallon for the week of September 21. That was 24.4 cents above the prior week and $2.725 above the comparable week one year earlier.
AAA's daily retail average and EIA's weekly on-highway benchmark use different collection schedules and methodologies, so the values should not be treated as the same series. Regional prices also varied sharply in EIA's September 22 release: $6.177 on the Gulf Coast, $6.680 in the Midwest and $7.456 on the West Coast. California was the highest listed state average at $8.246 per gallon.
What it means for drivers and carriers
Fuel is a major variable cost for trucking. A rapid increase can squeeze owner-operator cash flow, raise carrier fuel-surcharge calculations and change which loads or routes remain economical.
The benchmark is a national and regional average, not the exact pump price on a driver's route. Lease terms, fuel-card discounts, surcharge formulas, truck efficiency, idle time and deadhead miles determine the actual effect on a business or paycheck.
What to watch next
EIA's September 22 release is a measured weekly benchmark for September 21; it is not a government-set price. EIA lists September 29 as the next scheduled release. Separately, EIA's September Short-Term Energy Outlook forecasts U.S. distillate fuel inventories will fall below 100 million barrels in September and remain below the 2021–2025 five-year low through much of 2027.
The outlook projects an annual-average retail diesel price of $5.07 per gallon in 2026 and $4.40 in 2027. Those are forecasts, not promised pump prices. EIA finalized the model inputs on September 3, so the outlook does not specifically include later market events.
Drivers and small carriers should use current route-level fuel prices and their own surcharge agreement before accepting a load. A headline national average alone does not show whether a specific trip is profitable.
Primary sources and supporting records
- AAA: AAA Fuel PricesPrimary daily national retail diesel average and record comparison • Published 2026-09-26 • Checked September 26, 2026 at 7:12 AM
- The Wall Street Journal: Brent Falls Below $100 a Barrel on Hormuz Diplomacy HopesReputable same-day independent coverage corroborating the new AAA diesel record • Published 2026-09-22 • Checked September 22, 2026 at 7:38 AM
- U.S. Energy Information Administration: Gasoline and Diesel Fuel UpdatePrimary official weekly price benchmark and regional prices • Published 2026-09-22 • Checked September 22, 2026 at 5:14 PM
- U.S. Energy Information Administration: Short-Term Energy Outlook — September 2026Primary official forecast for U.S. distillate inventories and annual-average diesel prices • Published 2026-09-09 • Checked September 21, 2026 at 7:08 AM
- Reuters: Global diesel shortage likely to last into 2027 as storage tanks drainReputable same-day discovery and independent global diesel-market context • Published 2026-09-21 • Checked September 21, 2026 at 7:08 AM
- Associated Press: US diesel prices soar past $6 a gallon, deepening strain for hauling everyday goodsReputable independent reporting on broader market impact • Published 2026-09-11 • Checked September 15, 2026 at 5:05 PM
- Reuters: Oil settles $3 higher on Yanbu disruption, Saudi cargo cancellationsReputable independent reporting on current oil and diesel-market conditions • Published 2026-09-15 • Checked September 15, 2026 at 5:05 PM
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