Fuel Price Watch — Nuntius Logistics Intelligence

The one-liner: War premium, then a Friday fade — crude just posted its steepest weekly gain since mid-July (+6.6% WTI) as US–Iran fighting intensified, and US diesel pushed into record territory while pump averages sit 13 cents shy of the all-time high. The futures curve now pays buyers to lock winter barrels at 30–45¢ below prompt, and lube producers kept the pressure on with a $1.00/gal Motiva increase effective Sep 1.

Weekly snapshot

Series	Level	Move	Context
On-highway diesel (EIA weekly retail, US avg)	$5.599/gal (week of Aug 31, released Sep 1)	▼ −5.3¢ w/w (official print)	The print mostly predates this week's rally: pumps jumped +5¢ in one day to $5.68/gal by Sep 2 (GasBuddy) — just 13¢ below the all-time US record. California $7.22; New England $5.74; Gulf Coast $5.36.
NY Harbor ULSD / heating oil (front-month futures)	$4.44/gal	▲ +7.9¢ w/w (+1.8%)	Peaked at $4.68 early in the week, then gave back 3.4% Friday as tensions cooled intraday. Trade press reports US diesel prices hitting record highs on the US–Iran escalation.
ULSD winter months (Dec '26 / Jan '27)	$4.12 / $3.99	▼ 30–45¢ below front month	The curve flipped in the buyer's favor: the market is charging a war premium for prompt barrels, not for winter — locking Q4/Q1 volume now beats carrying prompt exposure.
Crude (WTI / Brent)	$88.87 / $93.32 checking daily crude feed…	▲ +6.6% / +4.5% w/w	Steepest weekly gain since mid-July on intensifying US–Iran fighting (Reuters); WTI peaked at $91.30 and Brent near $96 before a −2.5%-ish Friday pullback.
Residual fuel oil / bunker	$874.50/mt global avg VLSFO (Sep 3)	▬ flattening at highs	Sitting near crisis-era highs — Singapore VLSFO $855/mt (+$10 on the day); early-week gains are starting to level off, but unevenly across ports, and Red Sea tanker attacks keep risk premium in the market.
Base oils (Group II / III)	Increase wave lands Sep 1	▲ tightening	Motiva raised Group II+/III postings +$1.00/gal and Excel Paralubes Group II +30¢/gal, both effective Sep 1, after a month of producer announcements. Group III stays extremely tight — bright stock and 220N the hardest grades to source.

Plain-English takeaways

The war premium is back, and it is keeping diesel near records. Intensifying US–Iran fighting drove crude up 6.6% for the week — the steepest weekly gain since mid-July — and US diesel into record territory. Friday's 2.5% crude pullback shows how fast this premium can deflate, but headlines can re-inflate it overnight. Plan for volatility, not for a trend.
The official retail number lags the rally. EIA's weekly diesel average actually slipped 5¢ to $5.599 — but that survey closed before the mid-week spike, when pumps gained 5¢ in a single day to $5.68 (13¢ below the all-time record). Next Monday's print will capture the jump; anyone pricing off last Monday's data is a week behind.
Winter is trading cheaper than prompt — an unusual gift. December ULSD ($4.12) and January ($3.99) sit 30–45¢ below the front month ($4.44). The market is pricing a war premium into immediate barrels, not into heating season. Buyers with Q4/Q1 #2-fuel and heating-oil needs can lock volume against deferred months at today's prices rather than chasing the spike later.
Lubricants: the September increase wave has landed. Motiva (+$1.00/gal Group II+/III) and Excel Paralubes (+30¢/gal Group II) joined a month of producer increases effective Sep 1, while Group III supply stays extremely tight and Red Sea tanker attacks compound the squeeze. Contracts priced on 2025 assumptions are now materially underwater.

What this means for buyers

Bid pricing strategy: in a headline-driven market, flat quotes are a coin flip. Index live bids to a published benchmark (EIA weekly diesel or OPIS rack) plus a fixed margin, carry a contingency until award, and re-check rack prices daily on anything due next week — a 5¢/gal single-day pump move is the current reality.

Contract timing: for winter heating-oil and #2-fuel needs, price against the December/January months (30–45¢ below prompt) instead of rolling prompt exposure. The Friday pullback makes this week's windows attractive; waiting for "more certainty" risks paying the next war premium.

Escalator clauses: retail diesel has swung ~34¢/gal in three weeks (EIA, Aug 10 → Aug 31) — multi-month fixed-price contracts without escalators will bleed margin on one side. Tie contract pricing to the EIA weekly diesel average with monthly resets and a defined trigger (e.g., ±3–5¢/gal).

Lubricants & base oil: lock 6–12 month lube supply now that the Sep 1 increase letters are in, and tie pricing to published Group II/III postings with quarterly resets. For Group III, bright stock and 220N, secure allocation early — availability, not just price, is the constraint.

Sources (public): EIA Gasoline & Diesel Fuel Update, week of Aug 31, 2026 (released Sep 1; accessed via USDA AgTransport public mirror of EIA weekly on-highway diesel — eia.gov direct access was blocked at publish time, same EIA series); GasBuddy national average via Marketplace, Sep 2, 2026; Reuters oil & diesel market report, Sep 4, 2026; NYMEX WTI, Brent and front-month ULSD futures plus Dec-26/Jan-27 ULSD contracts via public Yahoo Finance quotes, Sep 4, 2026 (intraday); Ship & Bunker Global Average Bunker Price and BunkerIndex Singapore VLSFO, Sep 3, 2026; Lubes'n'Greases Weekly Americas Base Oil Price Report #87 (Motiva and Excel Paralubes Sep 1 increases; Group III supply commentary). Note: EIA weekly residential heating-oil price collection resumes October 2026 — futures carry the heating-oil signal until then. Prepared by Nuntius Logistics Intelligence, Tulsa OK — forward freely to clients.