On Thursday, September 24th, the debate over US diesel policy shifted from a blanket ban to a narrower implementation path. Retail prices remained near historical highs: the American Automobile Association (AAA) reported a national average price of $6.5141 per gallon, up from $6.5217 the previous day, $6.3956 a week earlier, and $5.6134 a month ago; the AAA's highest recorded average price was $6.5276 per gallon on September 22nd. The Energy Information Administration (EIA) reported a weekly average price of $6.529 per gallon for highway diesel in the week ending September 21st, up $0.244 from the previous week and approximately 74% higher than the $3.749 a year ago. Simultaneously, Energy Secretary Wright repeatedly briefed refineries, while the White House denied the existence of a finalized 90-day export ban text. For the refined oil market, the real challenge lies not in outlining slogans, but in how to reconcile refinery byproduct constraints, seasonal inventory fluctuations, and transoceanic flows.

Discussions over the ban have cooled down, and voluntary diversion has been put on the table.

The US president had previously stated publicly that he had asked his staff to assess diesel export restrictions. Wright then called industry leaders late Tuesday night, indicating that the restrictions were still under serious discussion. On Wednesday, his stance narrowed significantly. At an economic forum, Wright said that the authorities were working with industry to find "more cooperative ways to increase the supply of US diesel and curb upward price pressures," emphasizing that "it can be done in a simpler, more voluntary, and cooperative way, without using harsh tools that would reduce refining capacity." He later stated more directly: "Nobody wants a total ban or to reduce diesel exports to zero. That's not what's being discussed. What's being discussed is what's the most effective way to keep more diesel in the US while continuing to maintain maximum flows of gasoline and jet fuel." White House officials denied that a 90-day export ban was being drafted and called related reports inaccurate. Agriculture Secretary Rawlings had previously supported export restrictions; Treasury Secretary Bessant had a more lukewarm stance; and Interior Secretary Burham and Wright had been emphasizing the negative consequences of a hard ban for months. Iowa Senator Grassley urged the White House to listen less to lobbying from major oil companies, stating, "If chips can be embargoed, so can diesel." North Dakota Senator Cramer, on the other hand, explicitly opposed the export ban. This policy divergence demonstrates that decision-makers are dealing with a conflict between short-term political pressure and the physical constraints on refineries, rather than a pre-written embargo order.

Low inventory levels and persistently high exports form the data basis for policy frictions.

As of the week ending September 18, U.S. distillate fuel inventories stood at 107.431 million barrels, a decrease of 428,000 barrels from the previous week, with overall levels approximately 12% below the five-year average for the same period. Distillate fuel exports remained at 1.331 million barrels per day, a decline from the previous week's 1.614 million barrels per day, but still significantly higher than the approximately 851,000 barrels per day level a year ago. Apparent consumption of distillate fuels over the past four weeks was approximately 3.6 million barrels per day, while production was approximately 5.2 million barrels per day. In other words, the U.S. is not experiencing a shortage of diesel production for domestic use, but rather a simultaneous occurrence of high processing volumes, high exports, and relatively low inventories: domestic demand for road, freight, and agricultural fuels is keeping retail prices near record levels, while export windows are continuously sending incremental diesel to Latin America and Europe. On September 22, the spot price for ultra-low sulfur diesel in the Gulf of Mexico was $4.992 per gallon, creating a significant tax, logistical, and regional premium difference compared to historical retail highs. Diesel prices on the U.S. West Coast reached $7.456 per gallon this week, with California at $8.246; the Midwest at $6.680 and the Gulf Coast at $6.177.

Refineries are not single-product workshops; the ban will rewrite the balance between gasoline and jet fuel.

Diesel, gasoline, and jet fuel all come from the same atmospheric and vacuum distillation unit and secondary processing facility. Restricting diesel exports can, in the short term, force already produced distillate fuels back into US domestic tank farms; once tank capacity is full, refineries can only reduce crude oil processing volumes. Decreasing processing volumes lead to a corresponding decrease in gasoline and jet fuel prices. Wright explained this mechanism bluntly: when diesel exports are restricted, depleted storage space forces US refinery operating rates down, putting upward pressure on gasoline and jet fuel prices. The industry's assessment, relayed to the administration, is that export discounts may disappear within days, followed by contractions in crude oil procurement, secondary processing, and product mix; in the short term, the "extra diesel" will be offset by lower total output. European diesel prices continued to rise after the news broke, the logic of which is not complicated: the US is one of the world's largest sources of diesel exports; once the flow is rewritten by administrative measures, European and Latin American buyers will only be able to compete within a narrower spot window. If European demand collapses due to rapidly rising fuel costs, the feedback loop will quickly impact US export profits and refinery operating rates. For the market, what needs to be tracked is not the headline "whether it's banned or not," but three sets of verifiable variables: whether weekly distillate fuel inventories continue to be below the seasonal range, whether exports have further declined from around 1.3 million barrels per day, and whether refineries have proactively reduced their operating rates to make room for diesel fuel.

The Jones Act and the midterm election clock will determine how far the plan can go.

Industry experts suggested that if exports were to be restricted, existing Jones Act exemptions must be expanded simultaneously to allow more non-U.S.-built and operated vessels to transship diesel between U.S. domestic ports. Wright opted to focus on voluntary diversion: not aiming for zero exports, but rather adjusting some export destinations and timings to allow U.S. domestic tank farms and regional markets to gain incremental growth first. The advantage of this approach is that it doesn't immediately disrupt refinery material balances; the cost is weaker binding force, and the effectiveness depends on whether companies are willing to sacrifice immediate export netback. With the U.S. midterm elections approaching in November, freight and agricultural diesel prices have become central issues in the cost of living debate. The policy window is short, but adjustments to the physical system require tank capacity, shipping schedules, and secondary processing cycles. The market has already priced in a combination of "decreased probability of a full ban and increased probability of targeted diversion." If an enforceable text emerges, the key provisions will not lie in whether the word "ban" is used, but in the duration of the restriction, whether signed bills of lading are allowed to be fulfilled, the extent of Jones Act exemptions, and whether gasoline and jet fuel will be included in the monitoring.