Keeping American diesel at home sounds like the fastest way to make it cheaper, but the opposite could happen. President Donald Trump said on Tuesday that he backs a diesel export ban. That day, the national average diesel price hit a fresh record at $6.53 a gallon, according to AAA.
“I’ve said let’s not send out the diesel. We make a lot of diesel,” Trump said. Treasury Secretary Scott Bessent said the administration is studying a full or partial ban.
According to American Petroleum Institute CEO Mike Sommers, however, that would make things worse. A ban would push U.S. diesel prices below global levels and squeeze refining margins, the gap between crude costs and fuel prices.
Why The Plan Could Backfire
About 54% of U.S. refining capacity sits on the Gulf Coast, which makes more diesel than it uses.
Also, pipeline and geography limits keep that surplus from easily reaching the East Coast.
With exports blocked, Gulf Coast storage tanks would fill.
“Restricting U.S. energy exports would only compound the problem—exacerbating refining challenges and ultimately hurting consumers,” Sommers said on Tuesday.
Diesel Prices Hit Record As The World Loses Refining Capacity
When diesel gets more expensive, the cost of shipping almost everything rises, and that feeds inflation.
Global diesel markets have lost supply following disruptions to refining capacity in Russia and the Middle East. As a result, buyers turned to the U.S.
U.S. refineries are already operating near multiyear highs, while inventories remain tight.
API, the industry’s main trade group, says about 8 million barrels of diesel are traded by sea each day. The U.S. supplies roughly 20% of them.
Removing that supply would push world prices higher. Energy economist Philip Verleger said world prices could double, because diesel demand barely falls when prices rise.
How A Ban Could Push Prices Higher
There is another complication. Refineries cannot choose to make only diesel.
Processing crude produces a combination of gasoline, diesel, jet fuel and other petroleum products.
If Gulf Coast refiners lose access to overseas diesel buyers, storage tanks could begin filling. Eventually, refiners may have to process less crude.
That means less diesel but also less gasoline and jet fuel.
The Nixon-Era Lesson
In 1973, President Richard Nixon temporarily restricted U.S. soybean exports to contain domestic food inflation.
The move angered major customers, including Japan, and encouraged buyers to diversify toward suppliers such as Brazil.
Verleger said a diesel restriction could leave a similar scar: “A ban on US diesel exports, even if temporary, would have the same long-term effect as President Nixon’s soybean embargo.”
For Valero Energy Corp. (VLO), Marathon Petroleum Corp. (MPC) and Phillips 66 (PSX), that is the heart of the investment question.
A diesel export ban may lower U.S. prices briefly.
But if it cuts refining margins, fills Gulf Coast storage and forces refiners to reduce crude runs, America could eventually end up making less fuel.
At $6.53 per gallon, Washington wants a fast solution.
The refinery system may make that impossible.
