Diesel moves freight, farming and construction, and it is the tightest product in this market. It is also the product whose statistics are published under a different name.
Gasoline gets the coverage and diesel does the work. Nearly everything a household buys arrived on diesel, which is why a diesel shock passes into general prices through a channel gasoline does not have — it raises the cost of moving goods rather than the cost of commuting.
The first problem in following it is a naming one. The weekly government tables are written in “distillate fuel oil” and every news report is written in “diesel”, and the two are not the same category. This page separates them, prints the sulphur split that answers the question a reader is actually asking, and then explains why diesel is structurally tighter than gasoline in this episode — a yield constraint rather than a demand surge.
It also states, twice, that the record now being reported is a nominal record and not a real one.
Prepared by The Baratelli Institute · publication date September 10, 2026. Every figure below carries its own measurement date, which is set by whoever measured it and is often older than this page.
Distillate fuel oil and diesel are not the same thing, and EIA's weekly tables are written in the former while every news report is written in the latter. Distillate fuel oil is a refinery output category that includes on-highway diesel, off-road diesel, heating oil and some industrial fuels. Diesel sold at a pump is one sulphur grade inside it. So a headline about a distillate stock draw is not necessarily a headline about the diesel supply, and the sulphur split below is the part that answers the question a reader is actually asking.
This is the single most common category error in reporting on this market. A weekly distillate stock draw is reported as a diesel shortage; a distillate crack is reported as a diesel margin. In the present mix those readings happen to be close to right, and the next section shows why — but they are right by coincidence of composition, not by definition, and the coincidence is not stable.
Stocks as of the week ended August 28, 2026. The share column is the Institute's computation.
| Stock category | Million barrels | Share of total distillate | What it is |
|---|---|---|---|
| Total distillate fuel oil stocks | 104.2 | 100.0% | The number that appears in headlines. |
| — of which 15 parts per million sulphur and under | 94.2 | 90.4% | This is on-highway diesel. It is 90 per cent of the total, so in current practice the distillate headline is mostly a diesel headline — but that is a fact about the present mix, not a definition. |
| — of which greater than 15 to 500 ppm sulphur | 4.1 | 3.9% | Off-road and marine grades. |
| — of which greater than 500 ppm sulphur | 5.9 | 5.7% | Heating oil and industrial grades. This is the fraction that is genuinely not diesel. |
Source: EIA Weekly Petroleum Status Report, published September 2, 2026. Shares are of the total distillate figure in the first row, so the three sub-categories sum to the total and their shares sum to 100 per cent. Sub-15-parts-per-million material is on-highway diesel.
On-highway diesel is 90.4% of total distillate stocks — 94.2 million barrels of 104.2. So in current practice a distillate headline is mostly a diesel headline, and a reader who treats the two as interchangeable will usually be near enough right.
The reason to know the split anyway is that the fraction which is genuinely not diesel — the 5.9 million barrels above 500 parts per million, heating oil and industrial grades — is the fraction that behaves differently in winter. Heating demand competes with freight demand for the same refinery output, which is why the New York Harbor heating-oil crack and the diesel crack move together and why a cold northern winter is a freight-cost event as well as a heating event.
The observed stock above is 104.2 million barrels. The EIA's September 9, 2026 outlook forecasts that distillate inventories drop below 100 million barrels in September 2026 and stay beneath the 2021–2025 five-year low through much of 2027. That is a forecast and the 104.2 is a measurement, and they run on different clocks — the stock on the week ended August 28, 2026, the forecast on inputs completed September 3, 2026. The agency attributes the tightness to global distillate production running below last year's levels and to export incentives pulling barrels out of the domestic market, which is the same yield mechanism described below rather than a separate cause. Read it as the reason the 2027 price forecast implies a resolution: it does not assume inventories recover, only that they stop falling.
| Weekly flow | Figure | Measured | Source | What it carries |
|---|---|---|---|---|
| Distillate fuel oil production | 5,126 thousand bbl/d | week ended August 28, 2026 | EIA Weekly Petroleum Status Report, published September 2, 2026 | What refineries made. |
| Distillate fuel oil product supplied | 3,390 thousand bbl/d | week ended August 28, 2026 | EIA Weekly Petroleum Status Report, published September 2, 2026 | EIA's proxy for domestic consumption, computed as a disappearance residual. Production exceeding product supplied by 1,736 thousand barrels a day is the export and stock-build channel, and in a week of record margins that is where the barrels went. |
Refineries made 5,126 thousand barrels a day of distillate and domestic consumption absorbed 3,390. The difference, 1,736 thousand barrels a day, went to exports and to the stock build. In a week of near-record margins that is where the barrels went, and it is the mechanism by which a tight European or Latin American market pulls American product out of the country while American stocks look adequate.
Total distillate stocks of 104.2 million barrels against domestic consumption of 3,390 thousand barrels a day is 30.7 days of supply on the Institute's computation. Days of supply is the figure to use rather than the raw stock level, because a stock number in isolation says nothing about adequacy: the same tank farm is comfortable against weak demand and alarming against strong demand.
One caution on the consumption figure. “Product supplied” is not a measurement of consumption. It is a disappearance residual — what came out of the system minus what went into it — and it carries every measurement error in the surrounding accounts, in the same way the “distribution and marketing” line on the barrel-to-gallon ledger absorbs every error in the pump-price split. Read it as a good weekly proxy and not as a meter reading.
A gap of $1.810 a gallon in the same week. The received explanation is tax, and tax is 4.5% of it.
| Component of the diesel-over-gasoline gap | Cents per gallon | Share of the gap | Measured |
|---|---|---|---|
| Total gap at the pump — diesel $5.967 less regular gasoline $4.157 | 181.0¢ | 100% | week ended September 7, 2026 |
| of which tax — diesel 59.90¢ less gasoline 51.67¢ | 8.23¢ | 4.5% | January 2026 |
| of which everything else — crude grade, refinery yield, refining margin, distribution | 172.8¢ | 95.5% | two clocks — see note |
Retail prices: EIA, Weekly Retail Gasoline and Diesel Prices, U.S. average, all formulations; released September 9, 2026. Tax figures: EIA, Gasoline and Diesel Fuel Update — federal and state motor fuel taxes, stated by EIA as of January 2026, stated as of January 2026, and the state lines are volume-weighted averages excluding gross-receipts taxes and local levies. The two clocks in this table are the September 2026 retail week and the January 2026 tax schedule; the tax figures are fixed in cents and are updated roughly annually, so the mismatch is small but it is real and it is stated.
No federal fuel tax holiday is in effect. Congressional Research Service report R48948, dated May 15, 2026, records proposals only. The federal rate has not moved, which is precisely why the tax percentage of the pump price has fallen for four consecutive months while no tax was cut.
Diesel does carry more tax than gasoline — 59.90¢ against 51.67¢, a difference of 8.23¢ a gallon, federal and state combined. That difference is real and it is almost the whole of the conventional explanation for why diesel is dearer. It accounts for 4.5% of the current gap.
The remaining 172.8¢ a gallon is the market, and it is what the rest of this page is about. In an ordinary year the tax differential is a large share of a small gap and the conventional explanation works. In this episode the gap is several times its normal size, the tax term has not moved at all, and therefore essentially the entire widening is refining and crude-grade economics.
Diesel is structurally tighter than gasoline in this episode and the reason is a refinery yield constraint rather than a demand surge. A barrel of crude yields a fixed range of product cuts, and shifting yield toward distillate is limited by the configuration of the plant and the grade of the crude. The crude that has been removed from the market is disproportionately medium and heavy sour, which is the crude that makes distillate best. So the market lost the barrels most suited to the product in shortest supply, and no amount of refinery utilisation fixes a yield problem. That is the mechanism behind a distillate crack running roughly 74 cents a gallon above gasoline since March.
The price evidence is on the same week's spot legs. The New York Harbor distillate crack computes to $98.17 a barrel against a gasoline crack of $63.56 — distillate out-earning gasoline by 82.4¢ a gallon, or $34.61 a barrel, from the same crude in the same week. Every leg and the full computation are on the refining ledger.
A margin that size normally calls forth supply within weeks. It has not, and the reason is that the constraint is physical. A refinery's yield can be shifted toward distillate only within a range set by its units and by the crude it is fed, and the crude removed from this market is disproportionately medium and heavy sour — which is the crude that makes distillate best. The market lost the barrels most suited to the product in shortest supply. No amount of running the plants harder fixes a yield problem.
That is also why the seaborne product trade figures matter more than usual here. Diesel exports from Russia, the Middle East and Asia fell about 1.3 million barrels a day year on year in July 2026, roughly a fifth of global seaborne diesel trade. A shortfall in traded product is harder to arbitrage away than a shortfall in crude, because the substitute has to be manufactured rather than merely shipped.
Diesel printed $5.967 a gallon in the week ended September 7, 2026, up 36.8¢ from $5.599 the week before. That is the highest figure in the weekly all-types series, which begins in March 1994.
The prior nominal high on the weekly all-types diesel series (EMD_EPD2D_PTE_NUS_DPG, which begins March 1994) was $5.810 in the week ended June 20, 2022. EIA changed the methodology of the diesel series on June 13, 2022 — before the comparator week — so the two readings sit on the same side of the break and the comparison is clean. This is a nominal record only; see the real-versus-nominal ledger, where it is not one.
The prior nominal high of $5.810 was set in the week ended June 20, 2022. Deflated onto July 2026 dollars using the June 2022 CPI-U it is $6.547 — above the current price. Diesel would have to rise a further 9.7% to set a record in real terms.
So “record diesel prices” is accurate about the series and misleading about the burden, and this reference says both things in the same sentence wherever it says either. The full deflation, the CPI sources and the same treatment applied to the gasoline records are on the real-versus-nominal ledger.
Diesel is the product to watch and gasoline is the product being reported. The distillate crack has run above the gasoline crack since March 2026 and the same-week computation puts the gap at $34.61 a barrel. Diesel is also the fuel with the broader transmission into general prices, because it is a cost of moving goods rather than a cost of commuting. A commentary cycle organised around the gasoline pump price is watching the smaller variable.
This is a yield problem, and yield problems do not respond to price. A crack of that size would ordinarily clear itself within a quarter. The constraint here is the configuration of the plants and the grade of the available crude, and it has held since March. Anyone modelling a resolution should be modelling the return of medium and heavy sour crude rather than a refining response.
The official forecast implies a resolution that has not started. The current outlook (forecast completed September 3, 2026) carries retail diesel at $5.07 for calendar 2026 and $4.40 for 2027, against a September weekly print of $5.967. The 2026 average is arithmetically reachable because January and February were low. The 2027 figure is a statement that the disruption ends, and the Institute prints it as a forecast rather than as a finding.
Prices, the supply and demand balance, refining, the two-clock rule and the plain-English glossary that serves all 13 ledgers.
Back to the hub →LedgerWhere every cent of a $4.48 gallon goes — crude, refining, distribution and tax — with each of the four components on its own clock and three of the four defined differently from how a reader assumes.
Open the ledger →LedgerSeventy-six years of crude prices deflated to constant July 2026 dollars. The 2008 records are still records in real terms and today's are not close.
Open the ledger →LedgerOne central bank, one date, one fixing time. A dollar barrel converted into 29 currencies without mixing thirty sources and thirty clocks.
Open the ledger →LedgerWhat the shape of the curve does to inventory and why it drives storage behaviour rather than describing it — then the full strip: 63 listed WTI months from the exchange's own Daily Bulletin, $96.05 front against $72.60 a year out, $23.45 of backwardation, open interest printed beside every settlement.
Open the ledger →LedgerTwo entirely different questions that share one word. The price a well needs and the price a treasury needs, kept rigorously apart — with the gaps in each named.
Open the ledger →LedgerAll 41 countries the OPEC bulletin itemises, ranked, with share of world total and reserve life computed two ways. Venezuela first at 303.701 billion barrels; the United States ninth with a reserve life of 8.4 years.
Open the ledger →LedgerEvery OPEC+ member's output for July 2026 against its implied target and its sustainable capacity. Effective spare capacity is 1.09 mb/d, or 1.07% of a 101.5 mb/d market.
Open the ledger →LedgerThe seven countries that hold the voluntary cuts — not eight, and not the full membership — their August and September 2026 decisions, and why quota discipline is currently the wrong lens.
Open the ledger →Ledger588 rigs turning in the United States, 449 drilling for oil, 1,907 worldwide. A forty per cent move in price has produced a 1.4 per cent move in the American count.
Open the ledger →LedgerCapacity measured on two clocks five months apart, crack spreads computed from same-week legs in both units the market quotes, and the one undated figure on this reference, labelled as such.
Open the ledger →LedgerCommercial crude one per cent above its five-year average in the same week the Strategic Petroleum Reserve reads 39.3% of capacity and its lowest since November 1982. The two facts are causally linked.
Open the ledger →LedgerEight passages, six years of flows each, and bypass capacity that covers under a quarter of Hormuz. Plus what the industry itself expected in April, measured, and how wrong it was.
Open the ledger →Provenance. Reserve figures are transcribed from the OPEC Annual Statistical Bulletin; production, spare-capacity, stock and refining figures from the International Energy Agency Oil Market Report; United States production, refinery capacity and inventory figures from the Energy Information Administration; rig counts from the Baker Hughes North America and Worldwide rig counts; benchmark prices from published daily quotes. Each row names its source and the date the figure was measured. Where a figure was not published, or where a published series does not itemise a country, the cell reads n/d rather than carrying a fabricated estimate. Derived quantities — reserve life, shares of world total, capacity utilisation, spare capacity as a share of supply — are computed from the figures shown and are not separately sourced; they inherit the measurement dates of their inputs, and where the two inputs run on different clocks the page says so. The Baratelli Institute is a publisher operating under the Lowe v. SEC publisher exception. Nothing here is investment advice, a recommendation, or an offer to buy or sell any security or commodity. Figures change; verify against the primary source before relying on any of them.