Average diesel prices in the United States reached a record high of $5.85 per gallon on Friday, September 4, 2026. This peak follows global fuel market disruptions linked to the ongoing conflict involving the U.S., Israel, and Iran. According to data from the American Automobile Association (AAA), the current price represents an increase from the average of $3.71 recorded one year ago.
The price surge is attributed to rising wholesale oil costs after the conflict began in late February 2026. A central factor in the supply limitation is Iran's effective closure of the Strait of Hormuz. The narrow waterway serves as a transit point for approximately one-fifth of the world's oil supply. Current prices have surpassed previous highs recorded after the 2022 invasion of Ukraine.
In response to the rising costs, President Donald Trump announced an oil agreement with Venezuela on Saturday, August 29, 2026. The deal, which followed the U.S. seizure of former Venezuelan leader Nicolás Maduro in January, involves the development of 17 strategic oil fields. Interim Venezuelan President Delcy Rodríguez stated the project involves a $100 billion investment and could generate $209 billion in taxes for Venezuela. A U.S. official reported that the U.S. government will maintain 55% control of a joint venture with a private operator.
The record diesel prices affect the commercial transportation sector, including the operators of trucks, trains, boats, buses, and farming and construction equipment. For these businesses and independent contractors, fuel costs have risen by $2.14 per gallon over the last 12 months. In specific regions, the impact is even more pronounced; for example, drivers in Washington state are seeing average prices of $6.81 per gallon compared to $5.03 last year, an increase of $1.78 per gallon.
Gasoline prices have also reached a historical average of $4.15 per gallon, up from $3.20 a year ago. Analysts cited by the BBC expressed skepticism regarding whether the new Venezuela deal can overcome long-standing investment obstacles in that country's oil industry quickly enough to provide immediate relief.
The economic pressure comes as voters prepare for midterm elections in November 2026. Recent polling from Reuters/Ipsos indicates that President Trump’s approval rating has reached 33%, with 31% of Americans expressing approval of the current conflict. While the Venezuela deal has been announced, the timeline for when increased production might reach U.S. pumps remains unspecified, and the U.S. recently issued sanctions against a Turkish bank it identified as a financial lifeline for Iran to further increase economic pressure.