Why is diesel rising faster than gasoline despite both being oil products?

Diesel prices are being driven by supply-side disruptions independent of crude oil trends. Ukrainian strikes on Russian diesel-oriented refineries have reduced a major supply source, while Middle Eastern crude disruptions limit the heavier crude blends needed for diesel production. Additionally, gasoline demand has declined due to global EV adoption, reducing pressure on lighter refined products.

How does the Iran conflict affect Strait of Hormuz oil flows?

The Strait of Hormuz is a critical chokepoint for global oil transit. Vortexa data shows flows averaging 6-7 million barrels per day over the past month, well below pre-war levels of approximately 20 million barrels per day. Variability is high, with recent peaks near 10 million barrels per day but influenced by transit routing changes and tensions.

What should freight and logistics companies do about fuel surcharge exposure?

Companies should monitor the DOE/EIA weekly retail diesel average (the benchmark used for most surcharges), establish fuel hedging programs where feasible, and communicate proactively with customers about potential surcharge adjustments. The current volatility—including Monday's 22.72-cent drop—suggests short-term market swings will continue.

Is this price level sustainable or temporary?

The article indicates Monday's sharp decline followed U.S. Treasury comments favoring economic pressure over military action against Iran, suggesting some relief is possible. However, underlying supply constraints from Ukraine-related refinery disruptions and Middle East crude limitations appear structural, suggesting elevated diesel levels may persist for months.

What trade lanes are most exposed to diesel cost shocks?

North American trucking, which relies heavily on ULSD fuel, is immediately exposed. Longer-haul ocean freight operations are also affected, particularly those using marine gasoil (MGO) in compliance zones. Supply chains with tight margins or fixed-price contracts face the greatest vulnerability.

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High Impact

Diesel hits war high at $5.65/gal, disrupting trucking costs

Aug 25, 2026

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The signal

652/gallon according to the Department of Energy/Energy Information Administration weekly average. 5-cent increase over just two weeks and signals sustained pressure on transportation logistics costs for the broader supply chain ecosystem. Unlike gasoline, which has remained relatively stable over the past month, diesel has experienced disproportionate strength due to structural market factors independent of broader crude movements.

These include Ukrainian strikes targeting Russian diesel-oriented refineries, reduced global supply of medium-heavy crude blends from Middle Eastern sources disrupted by conflict, and the marginal barrel dynamics created by growing electric vehicle adoption worldwide. For supply chain professionals, this development carries dual implications: immediate cost pressures on freight rates and fuel surcharges, and longer-term uncertainty tied to geopolitical flashpoints. S.

Treasury comments on diplomatic rather than military approaches to Iran—underscores how quickly market sentiment can shift, making fuel hedging and surcharge forecasting increasingly complex.

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Simulation Suggestion

this month

What if diesel prices sustain above $5.50/gal for the next 90 days?

Model a scenario where benchmark ULSD remains elevated at $5.50/gallon or higher through the next quarter, driven by continued supply disruptions in Russian refineries and Middle East production constraints. Simulate impact on trucking fuel surcharges, LTL and TL rates, and total landed cost for goods moving via North American trucking. Compare to base case with diesel at $4.00-4.50/gal.

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Simulation Suggestion

immediate

What if U.S. policy shifts back to military action, spiking diesel to $6.50?

Model a risk scenario where escalating U.S.-Iran tensions reverse the current de-escalatory policy trend, leading to new military action or sanctions. Assume diesel prices spike to $6.50/gallon driven by supply fears and geopolitical premium. Simulate impact on carrier profitability, shipper freight budgets, and optimal sourcing and inventory strategies across North American supply chains.

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Simulation Suggestion

strategic

What if Strait of Hormuz flows drop to 4 million barrels/day?

Model a worsening scenario where geopolitical tensions escalate and Strait of Hormuz crude oil throughput declines from current 6-7 million barrels per day to 4 million barrels per day. Simulate cascading effects on global crude supply, refinery utilization rates, diesel and fuel pricing, and resulting impact on total logistics costs for a typical manufacturing supply chain with international sourcing.

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