US Diesel Hits Record $5.85 as Iran War Squeezes Fuel Flows

US diesel hit a new record on Friday, soaring to an average of $5.85 a gallon for the first time ever as the six-month war with Iran continues to disrupt the world’s flow of fuel. That is the Friday 4 September 2026 stamp. Live WTI and the South Korea Hormuz naval package are the other Iran/Hormuz tapes.

Pre-war baselines. Prior 2022 peak. Inflation color.

Before the US and Israel launched their war against Iran in late February, the national average for a gallon of diesel was about $3.76, per AAA on that wire. Regular gasoline averaged $4.15 a gallon on Friday, versus $3.20 a year ago and about $2.98 before the war — still well below the 2022 gasoline peak of nearly $5.02.

The last nominal diesel peak on the page was nearly $5.82 a gallon in June 2022, after the Ukraine war and sanctions on Russia. Adjusted for inflation, the page stamps 2008’s about $4.74 as roughly $7.20 in 2026 dollars, and 2022’s nearly $5.82 as about $6.56.

Hormuz bottleneck. Brent above $95.

Prices climbed as crude soared amid Middle East supply disruptions and production cuts, with most tanker traffic bottlenecked in the Strait of Hormuz. After cooling during summer peace hopes, oil renewed its climb as fighting escalated again between the US and Iran. Brent was trading at more than $95 a barrel Friday, up from roughly $70 before the war.

Freight, food, and surcharges

Because diesel runs freight and delivery networks, higher diesel lifts transportation costs for everyday goods. The Independent Grocers Alliance, as reprinted there, says fuel accounts for roughly 15% to 30% of the total cost of food. Michigan State’s David Ortega stamps refrigerated perishables as often first to rise; July grocery prices were up 2.7% year on year on that color, with seafood +7% and fresh fruit +4.9%.

Amazon rolled out a temporary 3.5% fuel and logistics surcharge on some third-party sellers in April. UPS, FedEx, and USPS also added fees on some packages earlier in the war, citing rising fuel costs. US NFP is still preview only later Friday.

Later Friday WTI below $89 is the crude session tape under the same Iran/Hormuz squeeze — distinct from this pump diesel record.

Iraq seeking Hormuz oil tankers is a separate Baghdad hiring tape — distinct from this US diesel pump record.

Informational only. Not trading advice, signals, or a guarantee of any market outcome.