U.S. gasoline prices have experienced a sharp increase over the last month, officially crossing the $4 per gallon threshold early Tuesday. This marks the highest national average since August 2022, when prices spiked following Russia’s invasion of Ukraine.

Global Oil Market Reacts to Geopolitical Conflict

The primary driver for this spike is the disruption of global oil shipments stemming from the conflict between the U.S. and Israel against Iran. Gasoline prices have risen more than 34% since the conflict began.

On Tuesday morning, the average price for gasoline in the U.S. stood at $4.018 per gallon. This represents a nearly 35% increase when compared to the average price recorded just one month prior.

Crude Oil Benchmarks Hit New Highs

The instability has significantly impacted crude oil futures. Early Tuesday, the global benchmark, Brent Crude futures, traded at $112.66 per barrel.

Brent Crude has consistently remained above $110 in recent days. This sustained high price level comes despite remarks from President Trump regarding peace talks with Iran failing to ease supply worries.

Furthermore, the U.S. benchmark, West Texas Intermediate (WTI), settled above $100 per barrel on Monday. This was the first time WTI surpassed the $100 mark since the Iran conflict commenced.

Steep Increases in Diesel Fuel Costs

Diesel fuel has seen an even more dramatic price escalation than gasoline. According to AAA’s tracker, the national average for diesel reached $5.454 per gallon early Tuesday.

This figure reflects a substantial 45% increase compared to the previous month’s average. Diesel is essential for fueling heavy machinery, including freight trains, trucks, tractors, and construction equipment.

Economic Ripple Effects Expected

The sharp rise in diesel costs is anticipated to create widespread inflationary pressure. Consumers can expect higher prices across various sectors, including groceries, farm goods, and shipping costs associated with online purchases.

Strait of Hormuz Blockade Intensifies Crisis

The conflict escalated after Iran retaliated against U.S.-Israeli strikes on its territory. Iran responded by targeting oil-producing Gulf states allied with the U.S. and imposing a blockade on the Strait of Hormuz.

This crucial waterway is responsible for transporting approximately 20% of the world’s oil supply. The Strait has remained largely closed to commercial shipping since the beginning of this month.

President Trump’s Ultimatum to Iran

In response to the closure, President Donald Trump issued severe threats against Iran in recent weeks. On Monday morning, Trump warned that he would be “blowing up and completely obliterating” Iran’s energy plants, oil wells, and the vital Kharg Island.

These threats were contingent on Iran failing to reopen the shipping route and agree to his proposed peace terms “shortly.” Reports indicate that Tehran has largely disregarded these warnings.