On the supply side, U.S. domestic shale oil is predominantly light crude, and the core alternative to the Strait of Hormuz — Saudi Arabia’s East-West pipeline — also primarily transports light oil, exacerbating shortages of heavy crude needed for diesel production. On the demand side, U.S. diesel consumption is almost entirely driven by commercial uses such as trucking, with demand still growing. Cost pressures will directly permeate every link in the supply chain, ultimately being passed on to end consumers through price increases.
U.S. diesel prices broke through $5 per gallon this week, reaching their highest level since the outbreak of the Russia-Ukraine conflict. The crude oil market turbulence triggered by the attack on Iran is now spreading to the broader real economy through diesel, a core fuel for industrial activity.
Unlike the gradual decline in gasoline demand, U.S. diesel consumption is almost entirely driven by commercial uses — including trucking, construction, and industrial production. The sharp rise in prices is directly eroding profit margins for countless businesses. This round of diesel price increases has significantly outpaced that of gasoline, highlighting the concentration of supply-side pressures.
The root cause lies in a structural mismatch of crude oil grades. Although the U.S. is the world’s largest oil producer, its domestic shale oil is predominantly light crude suitable for gasoline refining, while the heavy crude required to produce diesel and other distillates mainly comes from the Persian Gulf, Venezuela, and Canada.
As previously reported by Wall Street Wisdom, Saudi Arabia has reduced its crude oil production by approximately 2 million barrels per day, primarily cutting medium and heavy grades. Currently, Saudi oil transportation relies heavily on land pipelines rerouted to the Red Sea, but these pipelines are mainly used for transporting light crude.
Supply disruptions of heavy crude rekindle the 2022 crisis logic in the diesel market
The supply dynamics behind the current spike in diesel prices bear striking similarities to the situation following the outbreak of the Russia-Ukraine war in 2022. At that time, Western sanctions curtailed Russian heavy crude exports, leaving global refineries grappling with a shortage of heavy feedstock; now, the tensions surrounding Iran have disrupted the normal flow of Persian Gulf crude, pushing the market back into the same structural predicament.
The U.S. imported approximately 500,000 barrels per day of Middle Eastern crude last year. With this source now largely cut off, U.S. refiners are scrambling to secure alternative supplies at significantly higher premiums.
Energy giant Phillips 66 noted yesterday that the price discount of heavy crude relative to light oil has narrowed again — after having briefly widened due to increased Venezuelan oil flows to North America following the arrest of former Venezuelan President Nicolás Maduro, which temporarily supplemented some heavy crude supply.
Low inventories combined with rising demand have already exposed a diesel supply-demand gap before the crisis emerged.
In fact, even prior to the joint U.S.-Israeli strike on Iran, the U.S. diesel market was already under strain. Entering 2026, U.S. diesel inventory levels had already fallen significantly below the decade-long average, with the U.S. government forecasting continued declines over the next two years.
Meanwhile, U.S. diesel demand continues to grow, presenting a stark contrast to the slow decline in gasoline consumption. As nearly all diesel users in the U.S. are commercial customers, there is almost no buffer for price increases, and cost pressures will directly penetrate every link of the supply chain, eventually being passed on to end consumers in the form of higher prices.
The key variable in the current situation lies in when normal passage through the Strait of Hormuz will resume. According to Bloomberg, if tanker traffic cannot improve in the short term, dissatisfaction from freight, construction, and manufacturing sectors will continue to escalate.
For the market, the real risk does not lie in how high or low oil prices are, but rather whether the diesel shortage can transform this energy shock into broader inflationary pressure through linked increases in trucking costs, construction material expenses, and industrial goods prices.
Editor/Melody