US heating oil prices extended their rally above $4.20 per gallon, moving back toward a four-month high as prospects for a deal to reopen the Strait of Hormuz dimmed. President Donald Trump made demands on Iran, further dimming hopes for an agreement to reopen the waterway. This followed Iran’s statement that a deal with Oman on new shipping routes was close to being finalized, while warning that reopening the waterway remained conditional on Washington meeting additional demands. Meanwhile, an attack claimed by Iran-backed Houthi militants on Saudi Arabia’s Jazan refinery in the Red Sea compounded supply concerns. Saudi authorities said the fire was extinguished early Sunday but gave no further details. Russia’s fuel export restrictions have also added to supply concerns. Refinery capacity remains strained as demand outpaces supply, with US refiners processing crude at the highest seasonal pace since 2018 despite capacity having fallen by 600,000 barrels per day over the same period.