California diesel rises to 6.92 dollars a gallon from 5.10 dollars before the war as the world runs 8 percent short

According to AAA data reported on Monday 3 August 2026, the average price of a gallon of diesel in the United States is 5.36 dollars, while in California it is 6.92 dollars, up from 5.10 dollars before the Iran war began. The war has now entered its sixth month and petroleum product prices remain elevated.

Andy Lipow of Lipow Oil Associates said the combination of the war with Iran and Ukraine's intensified attacks on Russian refining infrastructure leaves the world short about 8 percent of global diesel demand. ExxonMobil chief executive Darren Woods said on Friday 31 July that the refining challenge will be with the world for a while, and that even once the strait reopens the lost Russian capacity remains a factor.

Nearly one third of US containership imports and exports move through the San Pedro Bay port complex in California, and goods are hauled by truck and rail paying that state's fuel prices before reaching shelves nationwide. JPMorgan analysts led by Natasha Kaneva wrote in a June note that a meaningful share of America's supply chain pays West Coast fuel prices, which influence freight costs, transport margins and ultimately the delivered cost of goods across the country.