Diesel Hits Record $5.90 a Gallon as Iran War Enters Its Eighth Month, US-Iran Talks Await Tuesday Response

Since the Iran war began at the end of February, U.S. diesel prices have jumped from $3.76 a gallon to $5.90, an all-time record that has already blown past the previous high set in 2022, according to CNN Business. Gasoline has climbed too, hitting a three-month high above $4.15 a gallon on Labor Day, per AAA data cited by CNN.

The total tab: $100.9 billion in extra spending on gasoline and diesel combined, according to a cost tracker run by the Watson School of International and Public Affairs at Brown University. That works out to $770 per household. Diesel alone accounts for $46 billion of that, or $348 per household, and it's still climbing.

"We're looking at a fall that's going to be the most expensive ever for gasoline, but really for diesel. And that's going to fuel every aspect of inflation," Tom Kloza, chief energy adviser at Gulf Oil, told CNN.

Talks Stall, Trump Says No

Seven months into the war, there's still no ceasefire and no reopened Strait of Hormuz. President Trump rejected Iran's latest proposal to restore full shipping lane access within seven days, according to BigGo Finance and Bloomberg reporting carried by Energy Connects. Washington has told mediators it wants firm commitments from Tehran on reopening the waterway and concessions on its nuclear program before any deal moves forward.

Iranian Foreign Minister Abbas Araghchi met with Qatari mediators in New York on Monday, September 28, and said he expects a US response by Tuesday, September 29. "We discussed ideas and how to find a formula that meets Iran's conditions," Araghchi said, according to BigGo Finance. Iranian officials have privately signaled a deal before the November midterms looks unlikely.

Iran wants sanctions and blockade relief tied to a phased Hormuz reopening. The Trump administration wants verifiable guarantees first, arguing a repeat of the collapsed mid-June ceasefire memorandum isn't worth signing again without teeth. Both positions are defensible on their own terms. What's not in dispute is that every week without a deal keeps pushing fuel costs higher.

Europe's Storage Problem

The pain isn't just American. EU Energy Commissioner Dan Jorgensen sent a letter to the bloc's energy ministers warning of a looming "price crisis linking to a supply crisis," according to Reuters reporting carried by Iran International, and urged governments to look at demand-cutting measures.

European gas storage sits at roughly 71% full, well below the five-year seasonal average of 87%, per Bloomberg data reported by Energy Connects. Germany, which holds the continent's largest storage capacity, is just over 57% full. Qatar has extended a force majeure on LNG shipments to Asia and Europe for another month, tightening supply further as roughly a fifth of the world's LNG that used to transit Hormuz remains disrupted.

Oxford Economics projects European gas will average €85 per megawatt-hour this winter, up 140% from a year ago. Marco Saalfrank, head of merchant trading at Axpo Holding, told Bloomberg that prices could top €100 if cold weather in Europe and Asia coincides with continued supply disruption, and that even a resolution wouldn't push prices back below the pre-war €30 level anytime soon.

GOP Candidates Push Relief, But It's Not Free

Republican Senate candidates Mike Rogers of Michigan and Ashley Hinson of Iowa called Monday for the war to end quickly and floated stopgap measures in the meantime. Rogers wants a temporary halt on U.S. diesel exports and suspension of the 70-cents-a-gallon combined state and federal gas tax. "Diesel fuels the trucks that bring groceries to the store. It fuels the tractors that grow our food," he said.

Hinson backed the same export pause and gas tax suspension, plus expanded E15 use, restoring the $1-per-gallon biodiesel tax credit, and a diesel relief program for farmers and truckers. She also said the highway trust fund should be replenished if the gas tax is suspended, "so Iowa roads and bridges do not lose funding."

A gas tax holiday sounds like free relief, but the highway trust fund doesn't refill itself. If Congress suspends the tax, that money has to come from somewhere else in the federal budget, or road maintenance gets deferred. Neither candidate has said which.

Goldman Sachs, meanwhile, raised its December Brent forecast by $5 to $85 a barrel and now expects Brent to average $80 through 2027, warning crude could top $120 if Gulf output stays depressed. Brent is currently flirting with $100 a barrel for the first time since July 23.

The question is whether Washington gets a response from Tehran this week that moves negotiations forward, or whether this drags into a second winter with storage tanks in Europe running dry and American households facing another $100 billion in fuel costs.