The U.S. national average price of diesel surpassed $6 a gallon for the first time in history on Thursday, according to fuel price tracker GasBuddy, as the ongoing U.S.-Israeli war against Iran and Ukrainian strikes on Russian refineries continue to strangle global fuel supply.
Diesel powers the trucks, trains, ships and heavy machinery that keep American supply chains running, along with the nation’s farming industry. The milestone marks the latest blow to consumers already grappling with elevated inflation, and it lands squarely in the middle of a political fight over the cost of living that could determine control of Congress in November.
“Every truck, every delivery, every package, every grocery run just got more expensive,” GasBuddy analyst Patrick De Haan wrote on social media platform X.
De Haan warned the record price would ripple far beyond the trucking industry. “Record diesel prices will impact every cargo, shipment, every delivery Americans are taking, and are likely to reignite inflation up and down the supply chain,” he said. According to GasBuddy, the national diesel average is now roughly $2.30 higher than it was a year ago.
Oil Prices Surge Alongside Escalating Iran Conflict
The record diesel price coincided with a sharp climb in crude oil futures, which pushed back above $100 a barrel as the conflict between the United States and Iran intensified. Brent crude settled Thursday at $107.63 a barrel, while West Texas Intermediate settled at $102.48 a barrel — the highest levels for both benchmarks since mid-May. Crude oil remains the single largest driver of pump prices for both gasoline and diesel.
Diesel inventories are also running well below normal. The U.S. Energy Information Administration reported that diesel stocks currently sit 13% below their five-year average, at 106.3 million barrels, even after inventories rose last week as refiners ran plants at full capacity to capture strong refining margins.
StoneX energy analyst Alex Hodes said the imbalance is being driven largely by disruptions to Russian diesel exports tied to Ukraine’s ongoing campaign against Russian refineries. “The diesel situation is continuing to be more bullish by the day. Russian diesel exports, or lack thereof, continue to be the biggest factor in the market,” Hodes said.
Hodes added that instability in the Red Sea region threatens to compound the supply crunch further. “The recent escalation by the Houthis in Saudi Arabia will possibly affect diesel exports out of the Yanbu port on the Red Sea, which accounts for around 400-500 Kb/d of diesel,” he said.
Trump Has Repeatedly Promised Gas Below $2 A Gallon Once The War Ends
The diesel record comes as President Donald Trump has continued to tell Americans that fuel prices will collapse once the United States claims victory over Iran, a war that entered its seventh month this week with no clear resolution in sight. In a Truth Social post earlier this month, Trump wrote that “oil prices will drop precipitously, like everything else is dropping (but more!), when we WIN the war with Iran.” He predicted gasoline would first fall to three dollars a gallon before eventually dropping “ultimately, below Two Dollars a gallon,” adding that “it will all happen quickly, and Iran will never have a Nuclear Weapon.”
Trump did not offer a specific date for when the war would conclude or when drivers might actually see those lower prices materialize. The pledge also marks a repeat of a promise Trump made during his 2024 presidential campaign, when he first floated the idea of sub-$2 gasoline.
On Wednesday, Trump acknowledged that any relief at the pump is unlikely to arrive before Election Day. He told reporters that energy prices elevated by the Iran war “will not come down until after the midterm elections,” and separately claimed the war itself would end “immediately after the election” — suggesting voters would head to the polls in November still paying record or near-record prices for both gasoline and diesel.
Energy Secretary Chris Wright has been notably more cautious than the president. Asked directly on CNN whether gas prices would keep rising, Wright told anchor Dana Bash he did not “want to have an opinion” on the trajectory, though he said prices were more likely to fall than climb. Wright has also downplayed the odds of a nuclear agreement between Washington and Tehran that could bring the conflict to a close.
Gas Prices Also Hit Records As Political Pressure Builds
The diesel milestone follows a similarly grim record for gasoline. The national average reached $4.15 a gallon over the Labor Day weekend, the highest Labor Day price on record according to AAA, surpassing the previous record of $3.82 set in 2012. That figure represents a roughly 30% increase from a year earlier.
A New York Federal Reserve analysis released September 8 found a growing share of households reporting worse financial conditions than a year ago, along with rising pessimism about the year ahead — a trend researchers linked in part to elevated fuel costs. A Reuters/Ipsos poll conducted last month found Democrats held an eight-point advantage over Republicans on which party voters trusted more to handle the cost of living.
Democratic officials have seized on the fuel price surge as a central campaign message. Democratic Congressional Campaign Committee Chair Rep. Suzan DelBene told reporters earlier this year that soaring gas prices tied to the Iran war amounted to “another broken promise” from Trump and congressional Republicans, and said House Democrats would continue centering affordability in their bid to retake the chamber’s majority.
Analysts Say A Return To Pre-War Prices Could Take Years
Even in the event of a ceasefire or resolution to the Iran conflict, energy analysts have cautioned that Trump’s promised price collapse is unlikely to happen as quickly as he has suggested. De Haan told fact-checkers that even a full reopening of the Strait of Hormuz would take weeks before oil flows normalized, and that “for pre-war prices to show up, it could take beyond a year.” Damage to Middle Eastern energy infrastructure sustained during the conflict could further delay any return to pre-war pricing, independent of how the war itself concludes.
With diesel now above $6 a gallon and gasoline hovering near $4.15, the gap between the administration’s stated price targets and the market reality has widened considerably heading into the final stretch of the midterm campaign season.