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Diesel topped $8 a gallon and gasoline climbed above $6 outside a Shell station in Carson, California, on September 22, 2026, according to a photo caption from Getty Images carried by CNBC. On October 14, 2026, the International Energy Agency said in its October Oil Market Report that the diesel squeeze behind those prices will not ease before the second half of 2027.
The short answer to why diesel costs so much right now: the war in Iran has disrupted shipping and refining in the Gulf, and the IEA says the lost supply will not be fully replaced for more than a year.
What cut diesel supply and why it keeps getting worse
Global diesel exports fell by 700,000 barrels a day year-on-year in September 2026, the IEA reported. Russia and the Middle East together lost 1.3 million barrels a day of diesel supply, only partly offset by higher output from other sources, the agency said. Separately, oil prices climbed on October 14 after two vessels were struck in the Strait of Hormuz, with Iranian officials telling Reuters they were deploying new tactics to target ships passing through the waterway, as reported by RTE. The IEA said that even with a rapid recovery in refinery output by year-end, gasoil supply would still fall short of demand in the fourth quarter of 2026, meaning depleted stockpiles are unlikely to be rebuilt before mid-2027.
From a tanker attack to the price at the pump
Here is the chain, using the IEA’s own figures. First, war-related disruption in the Gulf cut global diesel exports by 700,000 barrels a day. Second, with less diesel reaching refineries and ports, wholesale prices spiked: the IEA said diesel wholesale prices passed $200 a barrel in Singapore in mid-September 2026 and reached around $220 a barrel in Europe and the United States, levels the agency described as records. Third, those wholesale costs flow into what drivers pay, which is why the Shell station in Carson was showing diesel above $8 a gallon on September 22. The IEA also said diesel demand has stayed strong despite higher prices, calling it ‘relatively price inelastic,’ partly because government measures in some countries are cushioning the cost for consumers.
Our math: what a $220 wholesale benchmark means for a fill-up
This is an illustration, not a forecast. A barrel holds 42 gallons, a standard industry conversion. At the IEA’s reported $220-a-barrel wholesale benchmark, that works out to about $5.24 of wholesale diesel cost in every gallon. Compare that with the $8-a-gallon retail price shown at the Carson, California station on September 22: roughly $2.76 of each gallon would then reflect refining, distribution, taxes and the station’s margin on top of the wholesale cost. For a pickup truck with an 18-gallon tank, filling up at $8 a gallon costs $144, of which about $94 traces back to the wholesale diesel benchmark the IEA says has hit record levels.
What to check this week, and what could change the picture
Compare your local diesel and gasoline prices with the national averages the Energy Information Administration publishes weekly by region. Watch for the IEA’s next monthly Oil Market Report and for any further vessel incidents in the Strait of Hormuz, since the IEA itself warned that renewed Gulf attacks could delay the oil-supply recovery it is currently projecting. The IEA also said a proposed Russian diesel supply deal would have little macroeconomic impact on its own. Disclaimer: This analysis is for educational and informational purposes only and should not be construed as financial or investment advice.
Sources: CNBC, Fortune, Reuters (via RTE)
