President Donald Trump has urged Ukrainian President Volodymyr Zelenskyy to cease strikes on Russian oil refineries, citing record-high diesel prices in the United States. Trump stated that the attacks are causing a global shortage of diesel fuel and are hurting the world economy.

Speaking during his visit to Ireland on Sunday, Trump emphasized that Ukraine should target other legitimate military objectives instead of energy infrastructure. He noted that the United States had spoken directly with Zelenskyy about the issue.

US Diesel Prices Surge

The diplomatic pressure coincides with a sharp rise in fuel costs across the United States. According to data from the American Automobile Association (AAA), the national average price of diesel reached $6.2040/gallon on Sunday. Prices were significantly higher in California, where the average stood at $8.1367/gallon.

Some pump displays in California maxed out at $9.999 per gallon, a threshold that older mechanical meters cannot exceed before resetting to zero.

Global Supply Constraints

Russia, one of the world's largest diesel exporters, has banned diesel exports through the end of September. This export restriction, combined with the physical destruction of refining capacity due to strikes, has tightened global supply chains.

Trump argued that the current shortage is driven by the conflict in Europe rather than Middle Eastern supply issues. He reiterated that there are "plenty of other targets" available for Ukrainian forces.

Regional Tensions Escalate

Amid the price shocks, Iranian Parliamentary Speaker Mohammad Bagher Ghalibaf mocked the situation on social media platform X. He shared a clip from "The Simpsons" showing a gas pump resetting after hitting $9,999, captioning it "Free gas!"

Geopolitical instability in the Middle East further complicated the energy landscape:

• Oman postponed a planned meeting with Iran, citing the need for consensus and regional stability.
• Saudi Arabia shut down its East-West oil pipeline following multiple drone attacks launched from Iraq.
• Houthi forces in Yemen seized the strategic Mayun Island near the Bab el-Mandeb Strait, threatening key shipping routes.

What the Numbers Show

The divergence between national and state-level pricing highlights regional vulnerability. While the US national average was $6.2040/gallon, California's average of $8.1367/gallon represents a premium of nearly 31% over the national figure. This gap underscores how localized supply constraints or tax structures can amplify global shockwaves, even as federal-level averages remain lower.

The US national average price of diesel crossed $6 per gallon for the first time in history on Thursday, reaching $5.9773/gal. Simultaneously, diesel prices at five gas stations in California hit the pump-display maximum of $9.999/gal, signaling extreme regional volatility.

Former Congresswoman Marjorie Taylor Greene renewed criticism of President Donald Trump, noting that skyrocketing fuel costs are directly caused by conflicts with Iran and in Ukraine. She stated that diesel is now at its highest in history, predicting it will soon go past $8 per gallon in California.

Regional and Refining Pressures

Data from the American Automobile Association (AAA) showed the national average at $5.7832/gal on Thursday before rising further to $5.9012/gal on Tuesday. AAA data as of Thursday placed diesel at $5.9773/gal, its highest recorded average. California faced steeper increases, with the state average at $7.9114/gal. In Georgia, the state Greene represented in Congress, diesel currently averages $5.64/gal.

GasBuddy analyst Patrick De Haan confirmed that five stations in California were selling diesel at the dispensers highest possible price: $9.999/gal. He noted that prices have "maxxed out" at those stations.

The spike aligns with a record-high diesel crack spread of $102/bbl, reflecting the profit margin refineries earn from converting crude oil to diesel. This metric underscores the refining sector's response to supply constraints and demand shifts.

Market Reaction and Strategic Shifts

Ross Gerber of Gerber Kawasaki highlighted the geopolitical context, stating that rising gas prices reflect Iranian leverage over the Strait of Hormuz. He argued that this influence is temporary and emphasized electric vehicles (EVs) as viable alternatives to mitigate inflationary pressures on consumers.

Gerber previously noted that the conflict presents an opportunity to reduce global dependence on oil. His comments suggest a strategic pivot toward alternative energy solutions amidst sustained fuel cost volatility.

Geopolitical Context

President Donald Trump reportedly discussed ending the Iran war with Pentagon officials, citing economic strain on American consumers. The administration recently implemented a "tanker for tanker" policy against Iranian vessels and engaged in missile exchanges with Tehran.

Trump claimed the US had struck nine Iranian oil vessels, after the Islamic Revolutionary Guard Corps (IRGC) said it had struck two US vessels, which the US Central Command (CENTCOM) denied. Yemen’s Iran-backed Houthis captured the port city of Mocha amid rising tensions with Saudi Arabia, while unverified reports say the group has struck Saudi Arabia’s East-West oil pipeline, which has a capacity of 7 million barrels of oil per day.

Greene noted that Trump said he would end the Russia/Ukraine war day one and should have never started the Iran war. She argued that these "failed campaign promises" are hurting Americans as the cost of goods rises due to diesel-dependent logistics. She sarcastically remarked, "It’s so much winning we can hardly take it," after Trump touted reduced oil prices upon winning the war.

What the Numbers Show

A study by The Watson School of International and Public Affairs at Brown University illustrated that Americans had spent over $100 billion in excess fuel costs since the beginning of the war in Iran in February. Americans spent over $55.1 billion on gasoline and over $45.52 billion in excess diesel costs. Across roughly 131 million households, Americans spent an average of $421.05 per household in excess costs on gas. Texas and California led the excess costs incurred on gas at $5.1 billion and $4.7 billion, respectively.

De Haan shared that daily fuel bills were running $700 million per day higher than a year ago, adding up to $5 billion per week. He pointed to $6/gallon diesel and $4.2/gallon gasoline prices as drivers. GasBuddy also released a statement noting that record diesel prices will impact every cargo, shipment, and delivery, likely reigniting inflation up and down the supply chain.

Diesel prices have risen sharply since summer, driven by disruptions to global refining capacity. Last year, Ukrainian drone and missile strikes knocked out several Russian oil refineries, cutting into the global supply of refined fuel. Separately, tensions stemming from the Iran conflict have raised concerns about oil shipments through the Strait of Hormuz. A year ago, the national average stood at $3.71/gal. At $6 a gallon, diesel is up roughly $2.30 from a year ago.

Outlook and Consumer Impact

Market expert Patrick De Haan noted that the national average price of diesel was $5.90 and likely to hit $6 per gallon for the first time ever in the "next week or so." De Haan tweeted that the real story may be out West, suggesting California could blow past $8/gal, with some pumps not even built to display what could come next. He referred to the possibility of $10 per gallon in states like California, noting current displays often only have capacity for single digits and two decimal places.

De Haan stated that the average diesel price in the US is around 60% higher than a year ago, with prices up an average of $2.19 per gallon. While higher diesel prices may not impact consumers directly right away, it could have a trickle-down effect from companies raising prices, similar to what tariffs caused earlier this year.

Regular gas also hit a new national average high of $4.09 on Labor Day. The national average for regular gasoline stood at $4.2770, up from $3.1938 a year ago. Earlier this year, consumers said they were considering spending less money at restaurants or on groceries to offset the higher prices at the gas pump. Consumers were also spending more time at warehouse locations like Sam’s Club and Costco to get cheaper gas prices as a membership perk.

President Donald Trump recently said that the price of gas could fall back to $2 per gallon when the war with Iran is over. There is no timetable on when this could happen and right now consumers are likely to continue to feel the impact of both regular gas and diesel prices rising.