US diesel prices reached an all-time high of $5.85 per gallon on average, surpassing the previous record set in June 2022, as the six-month war with Iran continues to choke global fuel supply chains. The figure, reported by the American Automobile Association (AAA), exceeds the prior peak of $5.82 per gallon that followed Russia's full-scale invasion of Ukraine.
The surge has been dramatic. Before the US and Israel launched their military campaign against Iran in late February, the national average for a gallon of diesel stood at approximately $3.76, according to AAA. That means prices have jumped roughly 55 percent in just over six months, driven by production cuts, supply chain disruptions, and the bottleneck of tanker traffic through the Strait of Hormuz.
What is driving diesel higher
Brent crude, the international benchmark, was trading above $95 per barrel as of Friday, up from roughly $70 before the war began. Crude oil is the primary input for both diesel and gasoline, and its sustained elevation has translated directly into higher pump prices. Despite a brief retreat earlier in the summer amid hopes for a diplomatic resolution, oil has resumed its climb as fighting between the US and Iran has escalated once more.
The gasoline picture is similarly strained. The average US price for a gallon of regular gasoline hit $4.15, compared with $3.20 at the same time last year, according to AAA. That marks the first time gasoline has exceeded $4 per gallon on Labor Day weekend.
Why diesel matters more than gasoline
Diesel's record is arguably more consequential for the broader economy than a gasoline milestone. Diesel powers the majority of commercial freight networks in the US: long-haul trucks, trains, cargo ships, buses, farming equipment, and construction vehicles all run primarily on diesel. When diesel costs rise, the expense ripples through supply chains that touch nearly every consumer product.
Grocery supply chains are among the most immediately affected. Fresh produce, meat, and other perishable foods must be transported frequently and restocked on tight schedules, and diesel-powered trucks handle most of that work. Farming equipment used during harvest season also runs on diesel, adding another layer of cost pressure at the point of production.
Other sectors, including clothing, cosmetics, furniture, and general retail, face higher shipping bills as well. Some businesses have already begun passing these costs to consumers through added fees on online orders and package deliveries. Experts warn that the longer diesel stays elevated, the more these costs will compound and appear on store shelves.
Political and economic fallout
The fuel price spike arrives at a politically sensitive moment. AP-NORC polling conducted this summer showed that two out of three US adults disapprove of how President Donald Trump is handling the economy, and rising fuel costs add to voter frustration ahead of November's midterm elections.
Economically, the diesel record underscores the fragility of global energy supply lines during a sustained military conflict in the Persian Gulf region. The Strait of Hormuz, through which a significant share of the world's oil transits, has been a focal point of disruption since the war began. Even during periods of diplomatic optimism, the threat of renewed escalation has kept traders pricing in a war-risk premium that shows little sign of fading.
For American businesses and consumers, the immediate outlook offers little relief. With crude oil prices stubbornly elevated and no ceasefire in sight, diesel is likely to remain near or above record levels for the foreseeable future.
Sources
- [AP News: US diesel prices hit a record high at $5.85 on average](https://apnews.com/article/gas-diesel-prices-us-iran-war-ebd01b9773365ee40550dcfd7d3ebf87)
- [BBC: US diesel prices hit an all-time high](https://www.bbc.com/news/articles/c7903r0grx0o)
- [PBS NewsHour: US diesel prices hit a record high, pushing up transportation costs](https://www.pbs.org/newshour/nation/u-s-diesel-prices-hit-a-record-high-pushing-up-transportation-costs-for-a-long-list-of-goods)
