# What's happening Oil prices are high again, but the bigger problem is a fuel supply crunch. What started as a crude shock tied to the Strait of Hormuz has become a breakdown in how much crude refiners can turn into usable gasoline, diesel and jet fuel.
# Why refiners can't keep up
China has sharply cut oil imports and limited fuel exports to protect its domestic supply. That combination has left the US Gulf Coast effectively as the world's primary available refining region, and American refineries are running flat out to capture unusually high margins.
# What the markets are signaling Refiners' profit measure for diesel, the diesel crack spread, jumped to $102 a barrel — the highest on record. That level shows the market believes diesel is severely short. Bank of America noted this is the start of the U.S. demand season with "very little margin for error."
Large U.S.-based refiners and oil companies have benefited. Shares of Marathon Petroleum and Valero have more than doubled year-to-date, Phillips 66 is up about 90%, and major oil companies are seeing booming profits. Exxon reportedly made $160 million per day in the last quarter.
# How consumers and businesses feel it
Brown University's Climate Solutions Lab estimates higher diesel prices have cost U.S. consumers nearly $40 billion since the war started.
# Risks ahead U.S. refiners are pushing hard, but two seasonal threats could reverse the supply picture quickly. Hurricane season poses a known risk to Gulf Coast refinery operations. Fall typically brings refinery maintenance slowdowns, which reduce output — precisely when demand could remain strong.
# Bottom line The immediate crisis is less about crude availability and more about refining and fuel logistics. Attacks on refineries, export bans and shipping disruptions have reduced global refining capacity and curtailed exported fuel flows. That has pushed refining margins to record levels and translated into higher pump prices and transportation costs for consumers and businesses. The situation leaves little buffer for weather or maintenance disruptions as seasonal demand rises.