The war involving Iran has already saddled U.S. consumers with an estimated $100.5 billion in additional gasoline and diesel costs, according to a real-time tracker maintained by Brown University‘s Watson School of International and Public Affairs, as new threats from Tehran raise the risk of further disruption to oil and gas supplies.
Brown’s Iran War Energy Cost Tracker estimates that gasoline accounts for about $55.03 billion of the additional consumer burden, while diesel accounts for another $45.42 billion. The tracker shows gasoline prices at about $4.15 a gallon, 39.2% above its estimated no-war trajectory, while diesel has reached about $5.90 a gallon, 60.8% above its comparable benchmark.
The figures underscore the growing domestic cost of a conflict that is also threatening to keep global energy markets under pressure.
President Donald Trump is pursuing a dual-track strategy to pressure Iran into reopening the Strait of Hormuz, combining new sanctions with military strikes in response to Iranian attacks on commercial shipping.
The sharp rise in diesel prices is particularly significant because diesel is widely used in freight, agriculture, travel and other parts of the economy, potentially adding to inflationary pressures at a politically sensitive time for Republicans seeking to retain control of Congress in the midterm elections.
President Donald Trump has repeatedly argued that oil and fuel prices will fall sharply once the conflict with Iran ends, a position that contrasts with the continuing rise in energy costs for American consumers.
The Iran war has cost U.S. consumers an estimated $100 billion in higher fuel prices since Feb. 28, according to Brown University.
The average household has paid more than $760 extra, mostly for gasoline.
Texas has absorbed the biggest total hit at about $11 billion, followed…
— Clash Report (@clashreport) September 7, 2026
The rising consumer costs come as Iran threatens retaliation against further U.S. attacks on its assets, including energy interests in the Gulf.
“Strike our assets and you get struck,” Iranian Parliament Speaker Mohammad Baqer Qalibaf said Monday after U.S. and Iranian forces exchanged attacks involving commercial shipping over the weekend.
The warning raises the prospect of a wider disruption to Gulf energy infrastructure and shipping if the conflict escalates further. Oil prices climbed to six-week highs on Monday, with Brent crude reaching $98.06 a barrel during the session before ending at $97.31.
On Tuesday, Brent was trading around $97.34 as concerns over prolonged supply disruptions continued to weigh on the market.
The FT reported the Brown University figure yesterday in the story we cited above.
It’s available here: https://t.co/08OLzcfDLI US diesel prices soar as Donald Trump hauls in refiners
— Drop Site (@DropSiteNews) September 2, 2026
Iran has also tightened restrictions on shipping through the Strait of Hormuz, a critical route for global oil and gas supplies. On Sunday, senior Iranian security official Mohsen Rezaei said Tehran would soon announce a new restricted zone in the Gulf and establish a new shipping corridor through the strait.
Rezaei said the proposed zone would begin where a U.S. naval blockade of Iran starts and extend into parts of the Gulf. Vessels entering the area would be placed on an Iranian sanctions list, he said.
“We will only commit to the Strait of Hormuz being open when they stop the sabotage, threats and attacks on Iran,” Rezaei said.
The latest warnings follow a weekend escalation in which U.S. forces struck three Iranian oil tankers after Iran’s Islamic Revolutionary Guard Corps launched ballistic missiles toward two U.S. Navy warships, according to U.S. Central Command.
Washington said the tankers were part of an Iranian network that generates funds for the Islamic Revolutionary Guard Corps and its regional proxies. Iran’s Foreign Ministry condemned the attacks on commercial vessels as a “war crime” and an act of “economic warfare.”
The confrontation has left energy markets facing a potentially broader supply shock. Any prolonged disruption involving Gulf production, export facilities or tanker traffic through the Strait of Hormuz could push crude and refined-fuel prices higher.
Reports Monday also indicated that Saudi Aramco’s Jazan oil facilities in southwestern Saudi Arabia had been attacked. The Financial Times reported that damage was being assessed at the site, which includes a refinery capable of processing about 400,000 barrels of crude a day. Reuters said it was not immediately able to independently verify the report, and responsibility for the attack had not been established.
Iran on path of active deterrence: A new defense doctrine with new toolshttps://t.co/K9nnBTq6iG pic.twitter.com/qBChBhXpft
— IRNA News Agency ☫ (@IrnaEnglish) September 7, 2026
The pressure on U.S. consumers is already visible at the pump. Gasoline reached about $4.15 a gallon nationally on Labor Day as per AAA, a record for the holiday, while diesel also reached a record high.
The Brown tracker provides a real-time measure of the additional burden created by higher fuel prices since the conflict began on Feb. 28. Because the estimate changes continuously with fuel prices and consumption, the $100.5 billion figure is a snapshot rather than a fixed accounting of the war’s total economic cost.
The war in Ukraine and attacks on Russian energy infrastructure are also contributing to pressure on global diesel markets, adding another source of uncertainty for fuel prices.
Muhammad Luqman is Associate Editor at Views News Now. He writes on wide-ranging issues including economy, South Asia, the Middle East, agriculture, economy and innovation. Luqman has worked some of the leading news organizations and won acclaim for his original and research-based works.
