A narrow passage with worldwide consequences

The war involving the United States, Israel and Iran has turned the Strait of Hormuz into an especially dangerous shipping route. Reuters reported that just seven commodity vessels passed through on October 6, following a surge in tanker attacks. Some producers have increased exports using alternate routes, reducing—but not eliminating—the supply disruption.

Schematic of the Strait of Hormuz between Iran and Oman, connecting the Persian Gulf and Gulf of Oman; historical throughput was 20.9 million barrels daily in the first half of 2025.
Schematic, not to scale. Before the war, the EIA estimated that oil shipments through Hormuz averaged 20.9 million barrels daily in the first half of 2025—about one-fifth of global petroleum consumption.

Because oil is priced in an international market, American production does not insulate U.S. drivers from disruptions abroad. Riskier shipping can raise transportation and insurance costs even when some oil reaches buyers by another route.

What Americans are paying

AAA reported national averages of $4.36 for regular gasoline and $6.28 for diesel on October 8. A year earlier, those averages were $3.12 and $3.68. Higher diesel costs can affect trucking, farming and manufacturing, potentially reaching consumers through freight and grocery prices.

AAA national average prices, October 8: regular gasoline increased from $3.12 in 2025 to $4.36 in 2026; diesel from $3.68 to $6.28.
AAA national averages, rounded. These year-over-year changes are not a measure of the war’s isolated effect; refining conditions, demand and disruptions to U.S. Gulf production also influence prices.

Who is making the decisions?

President Donald Trump authorized the U.S. campaign against Iran and is considering further military options. Vice President JD Vance told Reuters that Iran must make meaningful reductions to nuclear enrichment to help end the war. Secretary of State Marco Rubio is engaged in diplomacy with allies and disputes Tehran’s claims of control over the strait. Defense Secretary Pete Hegseth oversees military operations and the burden on deployed forces.

That burden is tangible: the USS Abraham Lincoln is returning after a 265-day deployment that included operations in the Iran war, according to the Associated Press.

What is Congress debating?

On September 24, the Senate rejected an Iran war-powers resolution, 49–50. Four Republicans supported the measure alongside most Democrats; Pennsylvania Democrat John Fetterman opposed it. The vote highlighted disagreements about congressional authorization, presidential flexibility and the costs of continued fighting.

The unresolved trade-off

Supporters of military pressure argue that restricting Iran’s nuclear capabilities and defending international shipping are essential security goals. Critics argue that continued escalation could endanger U.S. service members, raise costs and complicate negotiations. Iran says it has a right to nuclear enrichment; the United States is demanding meaningful constraints.