Key Takeaways
- US gasoline prices have risen 15 cents in a week to $3.94/gal, pushing toward $4 again, while diesel topped $5/gal for the first time in three weeks.
- Although oil prices have risen ~16 % since the start of the Iran‑US standoff, gasoline and diesel prices have jumped more than 32 %, roughly double the crude‑oil gain.
- The disconnect stems largely from constrained global refining capacity: Iranian attacks damaged or destroyed ~30 Middle Eastern refineries, and Ukrainian drone strikes have crippled many Russian refineries, turning Russia from a major diesel exporter into a net importer.
- U.S. refineries are operating near‑full capacity (≈96 %) and have processed record volumes of crude, but a growing share of that output is being exported as jet fuel and diesel to alleviate worldwide shortages.
- Consequently, U.S. gasoline inventories have fallen to 210 million barrels—only ~20 million above critical lows last seen during Hurricane Katrina—while summer travel demand rises and diesel demand peaks with the fall harvest.
- High demand combined with tight supply has driven refinery crack spreads (the profit margin on turning crude into fuel) to record highs, with gasoline spreads up 60 % year‑over‑year and diesel/jet spreads more than double 2025 levels.
- Extreme summer heat further threatens refinery output, as high temperatures impede the cooling steps needed to produce gasoline, diesel and jet fuel, potentially tightening supplies even more.
Summary
U.S. fuel markets have been on a roller coaster as the intermittent conflict with Iran reshapes global oil flows. After a brief lull, the national average gasoline price jumped 15 cents in a single week to $3.94 per gallon, edging back toward the $4‑mark. Diesel, a key component of freight costs, surged above $5 per gallon for the first time in three weeks, according to AAA. These moves illustrate how directly the Persian Gulf situation can affect household budgets, yet the price dynamics are more nuanced than a simple oil‑price pass‑through.
Crude oil prices have risen roughly 16 % since the Iran‑U.S. standoff began, climbing from the low‑$70 range to above $85 a barrel after the collapse of a recent Memorandum of Understanding. Because crude constitutes the bulk of gasoline’s cost, one would expect fuel prices to track that increase closely. Instead, gasoline and diesel have risen more than 32 %—about double the crude‑oil gain. The disparity points to forces beyond the well‑head: refining bottlenecks and shifting trade patterns.
During the brief periods when the Strait of Hormuz remained at least partially open, oil companies managed to move over 200 million barrels of crude out of the Persian Gulf, temporarily pulling oil prices back toward pre‑war levels. Gas and diesel prices fell in tandem, but they never retreated to their pre‑conflict baselines. The reason is that the crude still needed to be processed, and the world’s refining infrastructure had been severely degraded. Iranian attacks damaged or destroyed roughly 30 Middle Eastern refineries, cutting global refining output by about 3 million barrels per day at the height of the disruption. Even after the temporary reopening of the strait, 2.1 million barrels per day of refining capacity remain offline, according to Natasha Kaneva of JPMorgan.
A separate but equally impactful shock is unfolding in Europe and Asia. Ukrainian drone strikes have devastated numerous Russian refineries, impairing the country’s ability to produce and export diesel. Russia, once the world’s second‑largest diesel exporter, has become a net importer, tightening global diesel supplies and contributing to the price spike seen at the pump.
Meanwhile, U.S. refineries are operating at near‑maximum levels—about 96 % of capacity last month—and have processed the highest volume of crude in the second quarter since 2019. Yet a record amount of the refined product is being shipped abroad: jet fuel to Europe and diesel to Asia and Australia, helping to fill the global supply gap created by the Middle Eastern and Russian shortfalls. This export surge has drawn down domestic gasoline inventories to 210 million barrels, just 20 million barrels above the critical threshold that preceded widespread shortages during Hurricane Katrina. With summer travel demand climbing and diesel demand set to peak as farmers begin the fall harvest, the combination of low supplies and high demand is a classic recipe for upward price pressure.
The tight market has translated into extraordinary profitability for refiners. Gasoline crack spreads—the margin between crude cost and wholesale gasoline price—are up roughly 60 % compared with a year ago, while diesel and jet fuel spreads have more than doubled relative to 2025 levels, per the U.S. Energy Information Administration. These elevated spreads reflect both the scarcity of refined products and the refiners’ ability to pass higher costs onto consumers.
Finally, extreme summer heat poses an additional risk. Refineries rely on cooling stages to separate crude into gasoline, diesel, jet fuel and other products. When ambient temperatures soar, the cooling process becomes less efficient, limiting the volume of fuel that can be produced even if crude is available. Should heatwaves persist, they could further curb output, exacerbating inventory draws and keeping pump prices elevated.
In short, while the Iran‑U.S. conflict initially drove the oil price rally, the current fuel‑price surge is largely a product of damaged global refining capacity, shifting trade flows that send U.S. refined product overseas, strong domestic demand, and weather‑related refinery constraints. Together, these factors have turned gasoline and diesel into markets that move independently of crude oil, leaving consumers feeling the pinch at the pump.