CHICAGO — U.S. diesel prices have climbed to a record national average of $5.85 a gallon, raising the prospect of higher costs for groceries, shipping, agriculture, construction and winter heating as global fuel supplies remain under pressure.
The new record, reported Friday by AAA, surpassed the previous national high of nearly $5.82 a gallon reached in June 2022, months after Russia’s invasion of Ukraine disrupted global energy markets.
The increase follows six months of conflict involving the United States, Israel and Iran, which has impaired shipping through the Strait of Hormuz and lifted oil prices. Ukrainian attacks on Russian refineries have added another supply shock to the global distillate market, which includes diesel and heating oil.
Diesel’s importance goes far beyond the fuel pumps used by truckers.
It powers farm machinery, freight trains, shipping networks, construction equipment, fishing boats, public buses and emergency generators. It is also closely linked to heating oil, meaning tight diesel supplies can affect household energy bills as the winter season approaches.
The fuel-price surge is already affecting businesses across the supply chain. Some companies have introduced fuel or logistics surcharges, and economists say the longer diesel remains expensive, the more likely that higher costs will appear in food prices, package deliveries and consumer goods.
“Diesel price has a very, very direct impact on everything that moves on pretty much any mode,” Ajesh Kapoor, chief executive of trucking technology company SemiCab, told The Associated Press.
The record comes at a politically sensitive moment. Higher energy costs can feed into inflation, complicate the Federal Reserve’s interest-rate decisions and increase pressure on the Trump administration ahead of November’s midterm elections.
A record that reaches beyond truck stops
AAA’s national average of $5.85 a gallon is a nominal record, meaning it is the highest price ever reported without adjusting for inflation.
That figure exceeds the June 2022 peak, when diesel prices surged in the aftermath of Russia’s invasion of Ukraine and international sanctions disrupted oil and fuel markets.
In inflation-adjusted terms, however, diesel has been more expensive before. In 2008, ahead of the global financial crisis, the average diesel price reached about $4.74 a gallon. Adjusted to 2026 dollars, that would equal about $7.20 a gallon. The 2022 record of nearly $5.82 would equal roughly $6.56 today after accounting for inflation.
That historical context offers little immediate relief to truck drivers, farmers and businesses paying today’s prices.
Diesel has remained above $5 a gallon since July 15, according to GasBuddy data cited by Reuters. Patrick De Haan, the fuel-tracking firm’s head of petroleum analysis, said 2026 is on track to become the most expensive year for diesel in U.S. history.
The price spike is especially significant because diesel demand is relatively difficult to reduce in the short term.
Households may drive fewer miles when gasoline prices rise. But freight companies still need to deliver goods. Farms still need to harvest crops. Construction sites still need equipment. Grocery chains still need refrigerated trucks to keep food moving from farms and warehouses to store shelves.
That makes diesel a direct cost of doing business across much of the economy.
Why diesel is rising
The record price reflects a combination of global supply disruptions and seasonal demand pressures.
The first factor is the conflict with Iran.
Before the war began in late February, roughly 900,000 barrels per day of diesel and 350,000 barrels per day of jet fuel moved through the Gulf, according to cargo-tracking firm Vortexa. Those volumes represented about 10% of global seaborne diesel supply and 20% of global seaborne jet-fuel supply.
Shipping through the Strait of Hormuz has been severely disrupted. On Thursday, only four commodity vessels passed through the strait, far below the 10-day average of approximately 15 vessels, according to preliminary shipping data cited by Reuters.
The United States has said Middle East oil flows have returned close to normal levels, but tanker trackers and analysts have disputed that assessment, saying commercial traffic remains seriously impaired.
The disruption does not necessarily mean all oil exports have stopped. But it has created uncertainty, higher insurance costs, altered shipping routes and concern that a fresh escalation could remove more supplies from the market.
Brent crude settled at $96.28 a barrel Friday, up 7.6% for the week. U.S. West Texas Intermediate crude closed at $91.48, nearly 10% higher over the same period.
Crude oil is the principal raw material for diesel and gasoline. When crude rises, retail fuel prices tend to follow.
The second factor is Russia.
Ukraine has launched repeated drone attacks on Russian oil refineries, disrupting fuel production at a time when Russia has been a major exporter of diesel. Moscow responded by banning diesel exports through Sept. 30.
That has tightened the global distillate market precisely as U.S. diesel demand is expected to increase.
The third factor is inventory.
U.S. distillate inventories, a category that includes diesel and heating oil, averaged their lowest August level for this time of year since 1982, according to Energy Information Administration data cited by Reuters.
On the East Coast, where many households rely on heating oil, distillate inventories fell to a record low of 19.3 million barrels for the week ended Aug. 28, based on EIA data going back to 1990.
That leaves little cushion if demand grows or further supply disruptions occur.
“We’re entering a key period for diesel consumption with the lowest inventories on record for early September,” said David Russell, global head of market strategy at TradeStation. “Farmers and truckers typically use more diesel in the autumn, which raises the stakes for the current crisis and increases the risk of sharper price increases.”
The freight and grocery effect
Diesel costs move through the economy in ways consumers may not immediately see.
The most obvious effect is on trucking. Nearly every product sold in the United States travels by truck at some stage of its journey from factory or farm to warehouse, distribution center, store or home.
Higher fuel costs can lead trucking companies to impose fuel surcharges. Those added expenses may initially be absorbed by manufacturers, wholesalers or retailers. But as freight contracts are renewed and margins narrow, more of the cost tends to reach consumers.
Food is especially vulnerable.
Diesel is used to power tractors, combines, irrigation equipment, fishing boats, refrigerated trucks and delivery fleets. It helps move crops from fields to processing plants, from processing plants to warehouses and from warehouses to grocery stores.
Fuel accounts for roughly 15% to 30% of the total cost of food, according to the Independent Grocers Alliance, which represents 7,500 supermarkets globally.
That does not mean grocery prices will rise by the same percentage as diesel prices. Food costs depend on many factors, including weather, labor, fertilizer, packaging, global commodity markets and consumer demand.
But diesel makes the entire supply chain more expensive.
David Ortega, a professor of food economics and policy at Michigan State University, said refrigerated products are often among the first to feel the impact because they require continuous energy-intensive transportation.
“In July, for example, overall U.S. grocery prices were up 2.7% compared to a year prior, but seafood prices were up 7%, and fresh fruit prices were up 4.9%,” Ortega told the AP.
He cautioned that each food category has its own supply-and-demand conditions. But he warned that the effects could increase over time.
“Early on, much of the cost increase gets absorbed along the supply chain through existing freight contracts and retailer margins,” Ortega said. “But as contracts reprice and fuel surcharges take hold, more of that cost makes its way to the grocery store.”
That means shoppers may not see the full effect immediately. The impact could build over months if diesel remains near current levels.
Packages, construction and public services
The diesel shock is not limited to food.
Back in April, Amazon introduced a temporary 3.5% fuel and logistics surcharge for some third-party sellers. United Parcel Service, FedEx and the U.S. Postal Service also added fees to some packages earlier in the war, citing increased fuel costs.
For online shoppers, that can mean higher delivery charges or merchants passing their increased logistics costs into product prices.
Construction could also be affected. Diesel powers excavators, bulldozers, cranes, generators and heavy trucks. Higher fuel costs can increase the cost of building homes, roads, factories and infrastructure.
Industrial operations, mining, rail freight and maritime shipping can face similar pressure.
Some public transit agencies operate buses or trains that use diesel. Cities and states may face higher operating costs, particularly if they are locked into limited budgets or long-term service commitments.
Diesel generators create another exposure. Hospitals, telecommunications networks, data centers, emergency services and remote communities often rely on diesel backup power during outages. Higher fuel prices can increase the cost of resilience during storms, blackouts and other emergencies.
The result is a broad inflationary effect.
“All sectors of the economy are affected by diesel,” Claudio Galimberti, chief economist at Rystad Energy, told Reuters. “This is one of the reasons why government bond yields in the United States are so high, it’s the expectation that inflation will continue to go up.”
Farms face a difficult fall
The timing is especially challenging for agriculture.
Autumn is a heavy diesel-use period in the Northern Hemisphere. Farmers use fuel to harvest crops, dry grain, transport produce, prepare fields and maintain equipment. In other parts of the world, planting seasons can create additional demand.
The high price may be particularly difficult for smaller farms, which often have less ability to negotiate fuel contracts or absorb sudden changes in operating costs.
Diesel also affects the price of farm inputs. Fertilizer, feed, packaging and equipment are all transported using diesel-powered networks.
The impact can be cumulative. A farmer may pay more to run machinery, more to receive supplies and more to deliver crops. Food processors and retailers may then face higher costs of their own.
The price pressure is not confined to the United States.
Global Petrol Prices data cited by the AP showed diesel prices in Nigeria had surged 90% since late February. Prices also rose nearly 87% in Indonesia and 77% in Lebanon.
Those increases are especially difficult for countries that rely heavily on fuel imports and have weaker currencies or limited government capacity to subsidize energy costs.
In Nigeria, diesel averaged $4.91 a gallon at the end of August, while Hong Kong had the world’s highest reported diesel price at $17.73 a gallon.
Refiners are producing more, but supply is still tight
U.S. refiners have increased operating rates to multiyear highs, trying to capitalize on strong profit margins and boost diesel production.
The diesel “crack spread”, the difference between crude oil prices and refined diesel prices, reached a record intraday high of $108.02 a barrel Wednesday. The spread is a rough measure of the profitability of turning crude oil into diesel.
High margins normally encourage refiners to produce more distillates. But refinery output cannot fully offset disruptions elsewhere in the global system.
Refineries require maintenance, cannot instantly change product output and depend on reliable supplies of crude, components and transportation. The disruptions in the Middle East and Russia have reduced global flexibility.
The sharp drawdown in inventories suggests that the market is already consuming supplies faster than they are being replenished.
Analysts say the next key period will be the transition from fall harvest into winter heating demand.
Diesel and heating oil are chemically similar distillate fuels. When temperatures drop, demand for heating oil can tighten the same supply pool used by truckers and farms.
That is especially important on the East Coast, where low distillate inventories could create vulnerability if winter weather is severe.
Political and economic pressure
The record diesel price arrives as the Trump administration faces growing political pressure over the economy and the war with Iran.
The average price of regular gasoline has also risen, reaching $4.15 a gallon compared with $3.20 a year earlier, according to AAA. The price was about $2.98 before the Iran conflict began.
Gasoline prices remain below their 2022 nationwide peak of nearly $5.02 a gallon, but they are high enough to affect household budgets and political sentiment.
The AP-NORC poll conducted this summer found that about two-thirds of U.S. adults disapproved of Trump’s handling of the economy, according to the AP.
High diesel prices may not be as visible to voters as the price displayed at a gasoline pump. But they can become politically significant through the products and services people buy.
A fuel shock that raises grocery bills, heating costs and delivery fees can deepen consumer frustration even if the source of the problem is global.
The inflation risk also matters to the Federal Reserve.
The U.S. economy added 162,000 jobs in August, a stronger-than-expected result that boosted expectations of an interest-rate increase later this month.
If diesel and oil prices continue to rise, they could add to inflation pressure just as the Fed is deciding whether the economy can tolerate tighter policy.
What comes next
The outlook depends heavily on events outside the United States.
If fighting with Iran eases and commercial traffic through the Strait of Hormuz improves, oil and diesel prices could retreat. If Ukrainian attacks on Russian refineries decline or Russia lifts its export ban, global distillate supply could improve.
But the risks point in the other direction.
An escalation in the Middle East, further damage to Russian refining capacity, a severe hurricane affecting U.S. Gulf Coast refining operations or a colder-than-normal winter could push diesel prices still higher.
Citi has raised its average Brent crude forecast for the third quarter to $86 a barrel from $80, citing a slower-than-expected reopening of the Strait of Hormuz. ANZ analysts raised their short-term Brent forecast to $95, with further upside risk if the conflict intensifies.
For consumers, the immediate impact may be gradual rather than dramatic.
The price of a grocery item may not jump overnight because diesel reaches $5.85. But if transport costs remain elevated, the effects can spread through freight contracts, farm expenses, delivery fees and retailer pricing.
The record diesel price is therefore not just an energy story. It is an inflation story, a food story, a logistics story and a household-budget story.
At $5.85 a gallon, diesel has become a costly reminder that global conflict and disrupted supply chains can reach Americans not only at the pump, but in almost every product that moves across the country.
