The national average price of on-highway diesel reached $6.51 a gallon on Monday, an all-time high, according to Bloomberg. The previous record, $5.82, was set in June 2022. Diesel has gained more than 87 cents this month alone and now sits roughly 75 percent above the $3.70 average that prevailed before the disruption of Iranian and Middle Eastern oil flows.
That number has turned a supply problem into a political one. For the first time in this cycle, the argument in Washington is not about whether diesel is too expensive — it is about whether the federal government should stop American refiners from selling it abroad.
The Ban Caucus Is Republican
The pressure is coming from within the president's own party. Senate Majority Leader John Thune said he is open to exploring restrictions on diesel exports, framing it as arithmetic rather than ideology.
"If the United States has the supply and is exporting it, that might be one way of getting at it," Thune said.
Senator Chuck Grassley was blunter, posting on September 20 that with "diesel $6.57 in Iowa," the president should impose "an embargo on diesel exports." Representative Tim Burchett of Tennessee has filed legislation that would prohibit diesel exports through January 2027, and Louisiana Governor Jeff Landry — whose state hosts some of the largest refineries in the world — has called for a 90-day ban.
The Administration Says It Would Backfire
The White House is not persuaded. Interior Secretary Doug Burgum drew the line clearly.
"We would consider an export ban if we thought that actually might lower prices, but that's not the case," Burgum said.
The technical case against a ban is a refining mismatch. The Center for Strategic and International Studies estimates that roughly 70 percent of U.S. refining capacity is configured to process imported heavy crude rather than domestic light crude. Blocking exports would not conjure additional barrels into that system. It would instead leave refiners — particularly those on the Gulf Coast built to serve foreign buyers — holding product they cannot profitably move, and the likely response is to run less, not more.
White House spokeswoman Taylor Rogers said President Trump "remains committed to unleashing American energy dominance, cutting costs, and putting more money back in the pockets of hardworking American families."
Inventories Leave No Cushion
The reason the debate is this sharp is that there is no slack anywhere in the system. U.S. distillate stockpiles are at their lowest seasonal level since 1996. For the week ending September 11, inventories ran 15.8 million barrels, or 13 percent, below the five-year seasonal average, according to Energy Information Administration data. Distillate exports were running at a record pace as recently as early August.
Gasoline is following at a distance, averaging $4.48 a gallon against $3.18 a year ago.
Why the Fed Is Watching
Diesel is a freight input, which means it propagates into goods prices with a lag rather than showing up all at once. That is precisely the dynamic keeping the Federal Reserve hawkish after it raised the funds rate to 3.75–4.00 percent in September, its first increase since 2023.
Chicago Fed President Austan Goolsbee, historically a centrist on the committee, made the point directly on Tuesday.
"We need evidence that these shocks are actually fading, or it's hard to see a credible path back to 2 percent inflation," Goolsbee said.
Crude and refined product prices did fall sharply Tuesday as President Trump signaled openness to meeting Iranian officials at the UN General Assembly. Marc Ostwald of ADMISI cautioned against reading too much into it, attributing the move largely to speculative positions being "stopped out" and noting that the threatened export ban was likely the more significant consideration for the product market. He added that every FOMC meeting should now be treated as live for a further hike.
Sources: Bloomberg, Yahoo Finance, U.S. Energy Information Administration, ADMISI (Marc Ostwald), TFTC