US dyed-diesel order: the federal tax stays in the pump price, and East Coast distillate stocks rose through October

Why these series belong together

The order relieves one fuel and leaves the other taxed. Three public series are read: the on-highway diesel price, taxes included; its gap with residential heating oil, the same distillate sold dyed and untaxed; and East Coast distillate stocks, the district where 82 percent of US heating-oil households live. The claim under test: trucks fuelling dyed draw on the heating-oil pool.

What the order changes, and what the pump price did

The order cites the tax on dyed fuel used on the highway (26 U.S.C. 4041), not the tax collected when clear diesel leaves the terminal (section 4081); the IRS states that the relief does not apply to clear diesel. On a dyed gallon it is 24.3 cents.

The on-highway price read 6.382 USD per gallon on 28 September [F2] and 6.199 on 5 October [F3], a fall of 0.183 before the order, then 6.179 on 12 October [F4], 6.352 on 26 October [F5] and 6.127 on 9 November [F6]. No step of 0.243 appears. The average carries state tax suspensions on clear fuel (North Carolina, Ohio), about 2.9 cents at full pass-through.

What heating oil and stocks did

Road diesel minus residential heating oil was 0.149 USD per gallon on 5 October [F14], 0.041 on 12 October [F15] and 0.067 on 19 October [F85]; it reopened to 0.122 [F86] and 0.154 on 2 November [F16]. The survey resumes each October: no reading precedes the order this season. East Coast stocks rose from 21,687 thousand barrels on 2 October [F33] to 22,551 on 30 October [F34]; in 2025 the same weeks went from 30,187 [F35] to 26,369 [F36].

Hypothesis · The October build has candidate sources unrelated to trucks: Gulf Coast supply redirected as exports fell, and households deferring fills. The 300 thousand barrels of the federal heating-oil reserve were awarded on 4 November, deliveries scheduled by 6 November, after those weeks.

What the sources cannot see

No public series separates dyed from clear distillate, so whether highway vehicles fuel dyed is measured nowhere, and the share fuelled from private tanks has no source. The dye is a tax marker injected at the terminal; EIA weekly stocks stop there and are split by sulphur class, not by dye; EIA's report of sales by end use is suspended. A stock draw is not a footprint of trucks fuelling dyed, and a build is not evidence against it. The Highway Trust Fund's monthly line is a transfer on Treasury estimates: October receipts read 1,062.7, 1,138.8 and 783.8 million USD in 2023 to 2025 with no relief in force [F68, F67, F66].

Who keeps the relief, and what locks the situation

Hypothesis · An operator with its own bulk tank switches in one delivery; a truck fuelled at highway lanes buys clear diesel. Most fuel surcharges follow the EIA taxed price, so a carrier that fuels dyed keeps the 24.3 cents, 3.97 percent of the 9 November price, while the shipper pays the index. Three locks: sellers, since NATSO writes that selling dyed fuel at scale "requires dedicated equipment" and SIGMA does "not expect most reputable diesel retailers and fuel marketers to do this"; the 31 December expiry, after which the penalty is the greater of 1,000 USD per act and 10 USD per gallon while dye can remain in a tank; and state taxes, 35.5 cents on average: the federal relief covers 40.6 percent of the combined tax.

Who sits on this chain

The American Trucking Associations, the Owner-Operator Independent Drivers Association and the Nebraska Trucking Association give one reading, no gain for carriers: same supply, minimal relief, members cautioned against dyed fuel. The American Farm Bureau Federation welcomes the order for farmers running their own trucks; the American Soybean Association asks that farmers owe no deferred tax and be held harmless for residual dye. NEFI advises heating-fuel dealers to keep collecting tax on on-road sales.

Hypothesis · Deduced: Love's Travel Stops and TravelCenters of America sell taxed gallons beside untaxed ones delivered to bulk tanks; Frontier Cooperative, Aurora Cooperative, Mansfield Energy and RelaDyne deliver to such tanks and may gain volume.

A conditional sensitivity, not a forecast

Scenario · The official figure of more than 100 USD saved per refill implies a fill of about 412 gallons at 24.3 cents; on the 200 to 300 gallons reported for a long-haul truck the federal saving is 48.60 to 72.90 USD. If every highway gallon were dyed, an arithmetic ceiling, not an estimate, about 750 million USD of federal tax a month would go uncollected.

Three dated readings, and what stays disputed

Hypothesis · Three readings are dated: the November gap on 2 December 2026, the texts carried by 31 December, and the pump price of 4 October 2027.

Hypothesis · The counter-analysis keeps two disagreements. The November reading is not a test of the order: a lower gap would say that heating oil gained at retail, which weather and supply flows also produce. The 2027 reading rests on a price, while a dated section 7508A text or statute on the tax of October to December 2026 is watched, not scored.

Hypothesis · Declared unconfirmed: the count of more than 4,000 retailers distributing dyed diesel; current state sulphur rules for heating oil; the dates of the Georgia and Indiana tax suspensions; suspensions in the comparison years; the weights of the EIA average; the December 2022 counter-case to household deferral. This edition does not judge the order and is not investment, tax or legal advice.