Diesel Hits $5.94 a Gallon, an All-Time Pump-Price Record, as Truckers Say Relief Isn't Coming Soon

Since the U.S. conflict with Iran began in February and choked off tanker traffic through the Strait of Hormuz, diesel prices have climbed almost without pause. On September 9, the national average per gallon of diesel hit $5.942, the highest ever recorded by AAA, according to Landline Media. That breaks the previous record set during the 2022 supply crunch.

American consumers have spent 62% more on diesel since the Iran conflict began in February, according to research from Brown University cited by Landline Media. This sustained cost increase has been building for seven months.

Why the Price Won't Come Down Fast

Andrew King, director of the OOIDA Foundation, told Landline Media that the problem isn't just crude oil prices, it's what it costs to turn crude into finished diesel. The crack spread, the margin refiners make turning crude into diesel, is running around $100 per barrel right now. Even if crude prices ease, diesel prices won't necessarily follow.

U.S. refineries are running at nearly 98% utilization, according to King, yet diesel inventories still aren't building the way they normally do this time of year. Refiners typically take units offline for fall maintenance, which King says could squeeze supply even further.

The U.S. Energy Information Administration's September outlook, cited by Landline Media, forecasts that constraints on traffic through the Strait of Hormuz will continue through the end of 2026, and that Brent crude prices will keep climbing through year's end. The EIA is forecasting a Q4 national average diesel price of $5.55 per gallon, though that figure sits below where prices already stand today.

Compounding the squeeze, Russia has suspended diesel exports following Ukrainian drone strikes on its refineries, according to TT News and Briefs.co, both citing Bloomberg reporting. Moscow is reportedly weighing whether to extend that ban another month, which would keep pressure on global diesel supplies longer.

Truckers Feel It First

OOIDA Executive Vice President Lewie Pugh told News Nation, in comments relayed by Landline Media, that every dollar diesel rises costs a trucker more than $400 to fill a truck. Pugh said the industry has been in "the longest freight recession in history," and just as freight demand started recovering, diesel prices spiked again.

The problem for truckers isn't just the price, it's the lag. Pugh said fuel surcharge contracts take time to catch up to actual diesel costs, meaning truckers absorb the increase first and get reimbursed later, if at all.

The American Trucking Associations reported that trucking activity in July ran 0.5 percentage points below the same month a year earlier, according to the Atlantic Council, with demand weak outside pockets like data center construction.

Rural America Bears the Brunt

Diesel isn't evenly distributed pain. The Atlantic Council's analysis found Wyoming, North Dakota, and Alaska had the highest per-capita distillate fuel consumption in 2024, and about 48% of truck vehicle miles traveled occur in rural areas. Nearly 3.5 million professional truck drivers work in the U.S., many of them based in rural communities where trucking is a major employer.

Harvest season is compounding the pinch. Farmers rely on diesel for tractors, combines, and irrigation equipment, and the Atlantic Council reports farmers are already warning they'll be squeezed by rising costs just as harvest gets underway.

The Stockpile Number Got Oversold

A wave of coverage in late August, including from Bloomberg (via TT News), Anadolu Agency, and Briefs.co, reported that U.S. diesel stockpiles fell to 103.4 million barrels for the week ending August 21, calling it a "record low." All three outlets were citing the same EIA release, not independent findings.

A fact-check published September 4 by thevaultreport's Research Desk found that framing was incomplete. Against the full 44-year EIA record, 103.4 million barrels ranks well above the all-time low of 87.2 million barrels set in April 1996, and stockpiles were actually lower as recently as May 22, 2026, at 100.8 million barrels. The August reading is a record only when measured against the same calendar week in prior years, a genuine seasonal low, but not an all-time low.

The one number that is a true record, according to thevaultreport's analysis, is regional: East Coast (PADD 1) distillate stocks fell to 19.3 million barrels for the week ending August 28, the lowest in that district's history dating to 1990. That's the region where New York Harbor sets the diesel futures price and where the Northeast still heats homes with oil, meaning the shortage is real, it's just geographically concentrated rather than nationwide.

Whether Moscow extends its export ban, and whether Hormuz traffic recovers before winter heating season peaks in October, will determine if the EIA's $5.55 Q4 forecast holds or gets revised upward again.