Diesel's national average set a record in the week of September 21, at $6.529 a gallon, and then it stopped setting records. The next reading in the Energy Information Administration's weekly survey, for the week of September 28, came in at $6.382, down 14.7 cents from the peak. The week before had been the violent one, up 24.4 cents in seven days.
The columns to the right on the same table are the ones that explain the politics. In the same week a year earlier, the national average was $2.628 a gallon. Two years earlier, $2.838. On the West Coast the current reading is $7.357, and in California it is $8.181. That is the squeeze behind the politics of the pump, and it is why the White House has spent a month auditioning tools that would normally sit in a drawer.
On Wednesday, at the White House, President Donald Trump said he is still weighing a ban on exports of U.S. diesel, the option that has been on and off the table since prices began climbing in the spring. The trade-off he described is the one his own energy secretary has been describing for a week.
The record the debate is aimed at is two weeks old
The president's language has moved from enthusiasm to something closer to caution. He said the idea is something "we think about and we talk about every day," and he volunteered the reason it has not been ordered: a ban would bring diesel down while pushing gasoline up. He also pointed to rising flows through the Strait of Hormuz and said he expects oil prices to come down on their own.
The survey numbers had already begun to undercut the urgency before he spoke. The on-highway diesel price is the number that fuel surcharges, delivery contracts and utility fuel clauses across the country are written against, and its newest entry is 14.7 cents below the record. The Gulf Coast, where most of the export barrels leave from, fell 22.2 cents in the same week, to $5.955 a gallon. The Midwest, where harvest demand is heaviest, fell 15.4 cents to $6.526.
One reading is not a trend, and the level is still more than double what it was a year ago. But an export restriction is a tool for a price that is rising, not one that is already coming off a peak. Every week the administration waits, the case for using it rests on a smaller part of the curve.
The pressure has a calendar behind it. Farm-state lawmakers have urged limits on exports during the fall harvest, which is the heaviest diesel season of the year across the middle of the country, and the governors who moved first represent states where a harvest that runs on diesel is underway right now. The November midterms sit at the end of that same calendar, which is why an instrument designed for an emergency is being debated as a seasonal measure.
A refinery makes one barrel into several products at once
The mechanical argument against a ban has been made most clearly by Energy Secretary Chris Wright, who has said publicly that he does not expect a blanket restriction. His warning is not about markets in the abstract. A refinery does not produce diesel. It produces a slate: diesel, gasoline, jet fuel and other distillates out of the same barrel of crude, in proportions fixed by the crude and the configuration of the plant.
When a refiner cannot sell the diesel portion abroad, that portion does not appear at a truck stop in Ohio. It goes into tanks that are already close to full, because the same tightness that raised the price also drew down distillate inventories. Once storage fills, the plant has two choices: process less crude, which shrinks the supply of everything else it makes, or shut units. Wright has said a ban could therefore put upward pressure on gasoline and jet fuel prices, which describes a refinery that responds to a blocked outlet by running less.
That is the trade the president described in one sentence, and it is the reason much of the industry argues the ban is self-defeating. It is also a claim the ban's supporters can answer. If the domestic market is short and exporters are shipping the marginal barrel to the highest bidder, then keeping those barrels home during a harvest and an election season is the point of having a policy at all. The Energy Information Administration made the pressure explicit in its own outlook, writing that tightness in the global distillate market "has raised domestic prices and incentivized U.S. exporters to increase distillate exports." Both readings of that sentence are defensible. Whether a temporary restriction is worth the trade is a policy judgment this article does not make.
Every remaining option is a tax or a nudge
The options in circulation say something about how the administration reads its own leverage. They are a suspension of the federal diesel excise tax, about 24.4 cents a gallon; wider legal sales of dyed off-road diesel, which is the same fuel without the on-road tax; a request to refiners to curb exports voluntarily; and a request to European governments to release emergency diesel reserves. An industry proposal to waive biofuel blending quotas was floated and largely set aside, because the corn and soy mandates behind it carry their own political weight in the same farm states that want cheaper fuel.
Not one of those options adds a barrel. The excise-tax suspension changes what a driver pays at the register and nothing about what the barrel costs. Expanding dyed diesel does the same, and it has a wrinkle: farms, construction sites and other off-road users already buy tax-exempt fuel, so a wider allowance mostly changes which vehicles may legally burn it without penalty, which is a real convenience and not a new supply.
The voluntary route has the same shape. Wright has described it as a matter of "some tweak in where diesel flows out of U.S. refineries," which is a real thing to ask for and a weaker thing than a rule. A request that refiners redirect cargoes leaves the decision with the companies that earn the export margin, and several have reportedly begun writing contractual protections in case the government acts anyway.
There is also the question nobody in the administration has answered in public: what instrument would impose a restriction, and for how long. A licensing regime or a directed allocation takes weeks to stand up, needs a legal theory that survives the first lawsuit, and has to be unwound without stranding cargoes that were already sold. An emergency measure announced in October and litigated in November would not be measured in months. That ambiguity is doing work of its own, because a threat that may not arrive still changes what refiners are willing to promise and what buyers are willing to pay.
The governors stopped waiting
The state-level response arrived first, and it is the clearest test of the tax theory. Louisiana's governor declared a state of emergency and suspended penalties for farmers and loggers using off-road diesel on highways through late October, saying the state would act rather than wait. Alabama's governor directed law enforcement to stop enforcing red-diesel restrictions for four months. Nebraska's governor signed an executive order letting highway-registered vehicles run off-road fuel without penalty and made livestock and produce haulers eligible for diesel-tax refunds.
The measures are quick, popular and legal, and they will help the specific businesses named in them. They are also, in aggregate, a state-level version of the move the White House is weighing: take a few cents off a price that is a few dollars above where it started. None of them touches the reason the barrel is expensive.
The barrels that would fix this are not in Washington's hands
The physical constraint is refining capacity in a world that lost some of it. Ukrainian strikes have taken Russian refining offline at a rate the president has called alarming. Flows through the Strait of Hormuz remain below pre-conflict levels. Global distillate production is expected to stay below last year's levels for months.
Those lost barrels have to come from somewhere, and for most of the year the answer has been the United States, whose refiners have been selling into the shortage rather than holding barrels back. That is the strongest argument for the ban and the strongest argument against it. Keeping barrels home would leave buyers in Europe and Latin America bidding for a smaller pool, and some of them hold reserves of their own that Washington has already asked them to open. A restriction that moves the shortage to allies is a foreign policy decision as much as an energy one, and it is being debated as a price at the pump.
The Energy Information Administration's September outlook projects U.S. distillate inventories falling below 100 million barrels and staying below the five-year low through much of 2027, with Brent crude averaging about $90 a barrel in the second half of 2026 before easing to $74 in 2027. Wright has said European allies will announce new supplies soon that could meaningfully push diesel prices down, which is the barrel-adding version of the policy, and it depends on other governments.
None of this makes the export lever useless. If the goal is the number on the sign at a truck stop in the week before an election, redirecting cargoes would probably move it, at least for a while, and the political logic of doing so is not complicated. The question is what it costs and who pays it: refiners whose economics depend on export margins, allies who have been buying the barrels, and drivers of gasoline and jet fuel, who would be paying more for the same barrel.
The number to watch lands on October 6
The next federal forecast from the Energy Information Administration is scheduled for October 6, and it will carry a fresh diesel price projection and a fresh inventory path. Between now and then, three things decide whether the ban stays a talking point or becomes a rule: whether the decline in the weekly survey continues for a second and third week, whether allied supply announcements arrive as promised, and whether the diesel price at the pump becomes a midterm argument that outruns the trade-off the president himself has now described twice.
There is a version of this story in which a falling price removes the question entirely, and an administration that never had to choose between two fuels. That version depends on a global refining system it does not control, and the last two weeks have shown that the number can move 15 cents in either direction without anyone in Washington doing anything at all.
Primary sources
- U.S. Energy Information Administration, weekly U.S. on-highway diesel fuel prices, for the readings of $6.285, $6.529 and $6.382 a gallon in the weeks of Sept. 14, Sept. 21 and Sept. 28, 2026, the regional and California figures, and the year-earlier comparisons.
- U.S. Energy Information Administration, Weekly Petroleum Status Report, for the distillate inventory series.
- U.S. Energy Information Administration, Short-Term Energy Outlook released Sept. 9, 2026, for the distillate inventory path, the Brent crude forecast, and the assessment of export incentives.
- Benzinga, account of President Donald Trump's remarks at the White House on Sept. 30, 2026, for the daily-discussion quote and the gasoline trade-off.
- Bloomberg (Jennifer A. Dlouhy, Ari Natter and Nathan Risser), report on the options under consideration by the White House, the federal and state diesel tax figures, and the actions by the governors of Louisiana, Alabama and Nebraska, read via the News-Miner's syndicated copy.
- Bloomberg, report on the call between Sen. Ted Cruz and refining executives and Energy Secretary Chris Wright's comments on a blanket export ban and on redirected cargoes, read via Yahoo Finance's syndicated copy.