Industry Odisha Bureau, Sep 29: America makes far more diesel than it uses. Yet pump prices have hit a record. Keeping exports at home sounds easy, but storage and refinery limits complicate it.
America’s diesel problem looks like simple arithmetic. US refineries make about 5.2 million barrels of diesel a day. The country uses only about 3.6 million. Yet diesel reached a record $6.52 a gallon on September 21. So why can’t surplus supply cool prices? The answer rests on complex logic inside every refinery.
A telling price gap
Diesel was roughly 74% dearer than a year earlier. Petrol rose only about 41% over the same period. Both fuels come from the same crude, so the gap matters. It points to a diesel-specific squeeze, not just costly crude.
The crack spread measures diesel’s premium over the crude it is made from. The US Energy Information Administration (EIA) has raised its outlook for that gap. It now expects it about a fifth wider than a month ago. Trucks, farm machinery, mining equipment and generators all run on diesel. Such demand is hard to cut quickly.
Exports are not a sideline
Over four weeks to September 18, refineries produced 5.22 million barrels daily. Imports added 0.12 million, taking supply to 5.34 million. Domestic use was 3.64 million, while 1.56 million went abroad. The remaining 0.14 million went into stocks. Roughly three in ten US-made barrels are exported.
The storage wall
Consider a hypothetical export ban. Exports ran at 1.33 million barrels a day in the week to September 18. If they stopped and nothing changed, 46.6 million barrels would pile up in five weeks. That is about 7.4 billion litres, slightly above current Gulf Coast stocks. This is arithmetic, not a forecast.
Public data on Gulf Coast refinery tank space ended in 2010. So nobody can say exactly when tanks would fill. Moving the fuel elsewhere is also hard. The Jones Act allows only American-built, -owned, -flagged and -crewed ships between US ports. The EIA’s record Gulf-to-East Coast sea flow is about 220,000 barrels daily. That is roughly a sixth of recent exports.
No switch for diesel alone
Unlike a laptop, a refinery cannot switch off one function at will. Crude passes through one linked chain of heating, cracking and blending. Petrol, diesel and jet fuel emerge together, with petrol the largest share. Refiners can tweak yields, but only slightly. If storage fills, the practical response is running less crude. Keeping today’s mix, cutting exported diesel implies roughly a quarter less crude. That is an illustration, not a prediction.
Shifting the shortage
Gulf Coast diesel prices might dip at first. Later, slower refineries could mean less petrol, jet fuel and diesel. Overseas buyers would chase barrels from fewer exporters. With Russian refineries disrupted, alternatives are scarce. The EIA estimates global oil stocks have fallen about 400 million barrels this year. A ban would not add supply; it would move the shortage.
India’s gentler lever
India has used an export duty since March 27, 2026. It peaked at ₹55.50 a litre in April and fell to ₹8.50 in July. It has been ₹20 since September 16, after 12 resets. Shipping one lakh litres now costs ₹20 lakh in duty. That discourages exports without banning them.
Flows, not just volumes
America’s diesel problem is not about producing too little. Storage, shipping and refinery design shape where fuel ends up. Export curbs can redistribute supply, but cannot create more of it.
