Why is diesel supply harder to rebalance than jet fuel?
Core argument: The crack spread averaged about $10.50 from 1985 to 2021 and never exceeded $30 even during the 2004–2008 refining boom driven by surging Chinese oil demand.
From 1985 to 2021, the crack spread averaged about $10.50. Even between 2004 and 2008 — the so-called golden age of refining, when Chinese oil demand exploded — it never surpassed $30. As refining has become ever more lucrative in recent months, every plant outside Russia, the Middle East and China is running as fast as it can. Unfortunately, the large size of the diesel market, at about 29.5 million barrels a day, means significant shifts in refinery output would be needed to move the dial on either supply or prices. To put this into perspective, jet fuel has a daily volume of less than 8 million barrels, so relatively small changes in refining output and airline consumption were able shift the supply and demand balance more easily. Ultimately, higher diesel prices should push demand lower, rebalancing the market — but that carries an economic cost, particularly for those countries that are more reliant on the fuel.

