The essentials
U.S. diesel averages $6.52 per gallon, up $2.76 since the Iran war began, as Strait of Hormuz traffic remains curtailed.
Traffic through the Strait of Hormuz has been curtailed since the war involving Iran began on February 28, 2026. Over the same period, the average U.S. diesel price has risen to $6.52 per gallon, an increase of $2.76 since February 27, 2026, the day before the war began.
The available figures do not establish a direct causal link between the curtailed strait traffic and the diesel increase, and the price movement is reported without a breakdown of contributing factors. Both developments occurred within the same window, but their relationship is not specified in the reporting.
The diesel figure is an average across the United States, so regional prices may differ from the national figure.
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Diesel buyers face a $2.76 per-gallon increase since late February
For households and businesses buying diesel, the national average now stands at $6.52 per gallon. Measured against the February 27, 2026 level, implied at $3.76 per gallon, the increase represents a substantial rise in fuel costs within a short period. Buyers absorb this change directly at the pump, regardless of its underlying cause.
Strait of Hormuz curtailment frames the energy supply debate
Viewed through supply conditions, the reduced traffic through the Strait of Hormuz since the war began on February 28, 2026, is a plausible driver of higher fuel prices. Under this reading, the timing of the diesel increase aligns with the disruption to a key waterway. Supply analysts would weigh how long the curtailment lasts and whether alternative routes offset the reduced flow.