After Wednesday’s International Energy Agency announcement that its 32 member nations would release 400 million barrels of emergency strategic reserves, the largest coordinated release in the IEA’s 51-year history, energy markets resumed their climb.
Brent crude topped $93 a barrel and WTI advanced 6.1% to $88.56.
But something extraordinary is happening in the fuel market.
The Crack Spread, And Why It Changes Everything
The crack spread is the margin a petroleum refiner earns by processing crude oil into saleable fuel products. It is calculated as the difference between the market price of the refined product and the cost of the crude feedstock.
When the crack spread widens, refiners earn more per barrel processed. What is driving spreads today is an active military conflict with no resolution timeline and a maritime chokepoint that carries one-fifth of global seaborne oil trade.
RBOB gasoline futures currently trade at $2.78 a gallon, or approximately $116.76 a barrel, one barrel contains 42 gallons. Against WTI crude at $88.56, that implies a gasoline crack spread of roughly $28 a barrel.
Gasoline demand, while affected by higher prices, is relatively elastic: consumers drive less, shift routes, consolidate trips. The market adjusts.
Diesel tells a different story entirely.
Ultra-Low Sulfur Diesel futures trade at $3.70 a gallon, approximately $155 a barrel. Against the same WTI crude input, the diesel crack spread is roughly $67 a barrel.
The all-time record, set in October 2022 at the peak of the European distillate crisis following Russia’s invasion of Ukraine, was $83 a barrel. The current spread sits at 78% of that record, and it is still accelerating.
The diesel crack is up approximately 60% month-to-date, on pace for the largest monthly percentage increase since Hurricane Katrina knocked out roughly 15% of U.S. refining capacity in August 2005.
Diesel powers the sinews of the physical economy, long-haul trucking, container shipping, agricultural machinery, construction equipment, military logistics.
Diesel demand is structurally inelastic: when supply is constrained, prices rise until physical inventory is rebuilt, not until consumers change behavior.
That is precisely what makes the current spread so durable.
The Margin Math For US Refiners, And The $260B Potential Earnings Windfall
The overall petroleum refining capacity of the United States totaled 18.4 million barrels per day in 2025, or 6.6 billion barrels in a year.
Applying the current blended crack spread of $40 per barrel, U.S. refining capacity implies roughly $268 billion in annualized gross refining margin potential across the industry.
In a conservative scenario, where the blended crack normalizes to $25 a barrel as some ...
