Diesel prices exceed gasoline costs in US
Historically, diesel fuel was often cheaper than gasoline in the United States, but that relationship began to change around 20 years ago. Since then, diesel has generally traded at a premium, with the current premium being unusually large.
In the mid-2000s, U.S. refiners faced new regulations requiring a significant reduction in the sulfur content of highway diesel. This shift increased production costs as refineries invested heavily in new equipment and faced higher capital and operating expenses. According to the Energy Information Administration, on-highway diesel prices have been higher than regular gasoline prices almost continuously since September 2004.
Diesel’s Historical Discount Disappeared
Before 2005, gasoline typically cost slightly more than diesel. However, after 2005, diesel became the more expensive fuel in most years. This reversal coincided with major changes in how U.S. refiners produced highway diesel, particularly the introduction of ultra-low-sulfur diesel, which increased production and distribution costs.
These factors created a structural premium that was less pronounced before 2004.
Another important change has been the globalization of the diesel market. Diesel and other middle distillates occupy an especially important role in the global economy, powering trucking, agriculture, construction, mining, shipping, industrial equipment, and heating systems. Strong demand in Europe, China, India, and the United States has kept pressure on global distillate balances for years.
Global Diesel Supply Disruptions
Diesel was hit particularly hard, with sanctions and trade restrictions forcing a rapid reshuffling of global flows. Similarly, in 2026, refinery disruptions, geopolitical conflicts, low inventories, and reduced exports from major suppliers have pushed the global diesel market into an unusually tight position.
According to the Energy Information Administration, global distillate supplies are tight due to reduced refining activity in Russia, China, and the Middle East. At the same time, U.S. refiners have been running near maximum utilization, with domestic distillate production averaging about 5.1 million barrels per day through August, the highest level since 2019. However, global demand for diesel has increased, and U.S. inventories have declined, with distillate inventories about 13% below the five-year seasonal average by mid-September.
Tanker costs and insurance rates have also risen, making it more expensive to move refined products around the world. As a result, the global diesel market is experiencing a scramble for middle distillates, with diesel being squeezed more severely due to shorter supply relative to demand.
Refining margins have surged as major refiners benefit from the tight market. However, these high margins result from constrained diesel supply relative to demand, not the other way around. When refinery capacity is disrupted, exports are reduced, and inventories decline, the value of remaining barrels increases, benefiting refiners still producing diesel.
Diesel is a different market than gasoline, serving different markets, having different seasonal demand patterns, requiring different processing, and facing different global supply pressures. A refinery cannot simply turn every barrel of crude into whichever product happens to be most expensive that day, as refinery configuration, crude quality, product specifications, and physical operating limits all constrain what can be produced.
