U.S. Diesel Hits $5.47 as Refining Crunch Deepens

U.S. diesel prices are within 6 percent of their all-time high, and the refining bottleneck behind the surge is tightening.

U.S. diesel retail prices hit $5.47 a gallon, within 6 percent of the record $5.82, as the Strait of Hormuz closure and Ukrainian drone strikes on Russian refineries push the diesel crack spread to historic highs.

"These are body blows to the economy's midsection, and I think they're going to have a pretty significant impact," Tom Kloza, chief energy advisor at Gulf Oil, said.

The diesel-to-WTI crack spread has more than doubled since Feb. 28, when the U.S. and Israel launched strikes on Iran, and has risen more than 20 percent this month alone. The premium now stands near $100 a barrel, roughly triple the 2025 average. U.S. refineries are running at near-full capacity, leaving almost no buffer for further disruptions.

The surge threatens to push broader inflation higher, lift Treasury yields to multi-year highs, and squeeze farmers and truckers ahead of the winter heating season. With midterm elections approaching, the White House faces mounting political pressure, and analysts warn that export restrictions — previously rejected — could return to the table if prices stay elevated into October.

The supply shock traces to two overlapping geopolitical fault lines. The U.S.-Iran war has choked traffic through the Strait of Hormuz — only five vessels transited the waterway on Saturday and none on Sunday, according to ship-tracking data — while Ukrainian drone strikes on Russian refineries have cut output from one of the world's largest diesel exporters. Energy Aspects analyst Robert Campbell said the U.S. has become the "last supplier standing," with Middle Eastern and Russian refining capacity sitting idle.

Crack Spread Doubles to Near $100 Premium

U.S. refiners are running at maximum utilization, shipping record fuel volumes to global markets. But analysts warn the pace is unsustainable as inventories draw down. "When the refining system is running flat out, every producer matters," said Kevin Book, analyst at ClearView Energy Partners. "Any outage — whether from war or accident — can tighten supply significantly."

Kloza also flagged the threat of hurricane season. "Just the threat of one storm could make things quite ugly," he said. "There's potential for what I'd call absurd numbers — $5, $6, even $7 a gallon."

Farmers and Truckers Bear the Cost

Diesel price increases hit trucking and agriculture hardest, with costs transmitting through supply chains to the broader economy. John Boyd, founder and president of the National Black Farmers Association, said the surge is pushing many farmers toward bankruptcy. "Farmers are extremely vulnerable to diesel cost increases, and this comes after a big jump in fertilizer prices — also driven by the Iran war," he said. "My tractor holds about 100 gallons, and filling it up has become very expensive."

The timing compounds the pain: families are stocking heating oil before winter, retailers are preparing for the holiday season, and farmers are in the critical pre-harvest window.

The price surge is intensifying political pressure on the Trump administration ahead of midterm elections. A Financial Times poll shows most voters believe their economic situation has worsened under Trump. The White House has coordinated record strategic petroleum reserve releases and eased some sanctions on Iranian and Russian crude exports, but analysts expect more aggressive measures if prices persist.

"Bad ideas that were rejected in April could be revisited if prices stay high in October," Book said.

Meanwhile, crude benchmarks have remained relatively subdued — Brent settled at $90.87 a barrel Monday, up $2.32, while WTI rose $2.08 to $84.50 — as the market prices in demand weakness. The International Energy Agency now forecasts global oil demand will fall by 1.6 million barrels a day in 2026, 510,000 barrels more than its July projection. Oxford Economics expects Brent to average in the mid-$80s through the rest of 2026, with intermittent strait transit and informal arrangements partially offsetting lost supply. A surprise 17.4 million barrel build in U.S. commercial crude inventories last week also helped keep crude futures in check, according to the Energy Information Administration.

This article is for informational purposes only and does not constitute investment advice.