US diesel hits record $5.942 a gallon after Iran war refinery damage
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The gist
US average diesel hit a record $5.942 a gallon in September, up roughly 70 percent since February.
Diesel now drives inflation and midterm politics even as crude prices fall.
Background
Diesel is the fuel that moves trucks, farm equipment and heating oil, and its US benchmark price is tracked by the International Energy Agency (IEA), an energy agency that publishes monthly oil market reports. Prices climbed after Washington and Tel Aviv attacked Iran on Feb 28, 2026, and Iran struck refining infrastructure around the Persian Gulf in response, while Ukraine's drone strikes cut Russian refinery output to about 60 percent of capacity. Analysts say the surge reflects a refinery capacity deficit rather than a shortage of crude, and diesel supplies were already tighter than gasoline before the war.
How it unfolded
- Feb 28, 2026Washington and Tel Aviv attacked Iran; US diesel has risen roughly 70 percent since then.
- Mar 7, 2026US diesel sold for $4.51 a gallon, up about 75 cents in a week, as Brent climbed 27% to $92.69.
- Apr 6, 2026Average retail diesel rose to $5.643 a gallon, up 24.2 cents in a week; California diesel passed $7.50.
- Jul 31, 2026Diesel stood at $5.34 a gallon, about 50 cents below AAA's all-time record of $5.816.
- Sep 9, 2026The national average reached $5.942, the highest ever recorded by AAA.
- Sep 11, 2026The IEA cut its 2026 global demand growth estimate by 2.5 million barrels a day year-on-year and pointed to record diesel prices.
- Oct 9, 2026President Trump announced Russian diesel deliveries to the US and world markets; NYMEX ULSD fell 4.6% to $4.73 a gallon.
- Oct 10, 2026Russia partly lifted its diesel export ban, at first for 500,000 tonnes.
- Oct 30, 2026Citi reported oil up roughly 60% since February, jet fuel up 100% and diesel up 110%.
- Nov 3, 2026Axios reported the 20-day rolling correlation between US diesel futures and Brent crude had vanished over the previous couple of months.
- Nov 4, 2026Record diesel prices became an unexpected talking point in coverage of the 2026 midterm elections.
Key terms
- midterm
- US general elections held near the midpoint of a president's four-year term, when all House seats and about a third of Senate seats are contested.
- Brent
- A major global benchmark grade of light, sweet crude oil from the North Sea used to price oil worldwide.
- NYMEX ULSD
- Diesel fuel with substantially lowered sulfur content, traded as a futures contract on the NYMEX exchange.
Source: Wikipedia
Who’s saying what
- Analysts
- IEA analysts say diesel has eased from September's all-time highs of more than $200 a barrel but remains nearly double crude oil and pre-crisis levels, raising the cost of goods and hitting real incomes, activity and inflation.
- Expert
- Oil markets expert Tom Kloza has warned that diesel, not crude oil, is the price to watch.
- Official
- President Trump has repeatedly suggested fuel prices will fall when the war with Iran ends.
- Analysts
- Citi Research, led by Global Chief Economist Nathan Sheets, expects global headline inflation of 3.4% this year versus 2.8% last year, easing to 3.0% next year if oil prices moderate.
Still unverified
How much Russian diesel actually arrives and when is unconfirmed beyond Moscow's first tranche; insider reports said Trump was considering a new offensive shortly after the midterm elections.