US Diesel Up 71% From a Year Earlier as Iran War Drives Refining Surge

US diesel averaged about $6.32 per gallon on October 30, 2026, up 71% from a year earlier. Gasoline averaged $4.20, nearly $1.20 higher. Reuters linked a refining surge, driven by the U.S.-Israeli war on Iran, to higher oil company profits, including ExxonMobil and Chevron's third-quarter results. Refining turns crude oil into fuels.