US Diesel Tops $6 a Gallon for First Time Ever

The U.S. national average price of diesel surpassed $6 a gallon for the first time on Friday, reaching about $6.05 as Washington’s war with Iran disrupts the world’s flow of fuel and drives up the cost of hauling everyday goods, according to NPR.

The record came a week after diesel set a then-all-time high of $5.85 and now costs roughly 63% more than it did a year ago, when the national average sat near $3.70. Regular gasoline also climbed to an average of $4.29 nationwide, up from $2.98 before the war. The surge follows U.S. crude oil futures topping $100 a barrel on Thursday for the first time since May, with Brent crude trading above $105 a barrel on Friday.

Why diesel matters more than gasoline

Diesel is the backbone of the freight economy. It powers the trucks, trains and ships that move goods to market, the farm equipment that plants and harvests food, and some of the buses and backup generators that keep communities running.

“It’s the more insidious, more costly, and more impactful fuel,” Bob McNally, president of the energy consultancy Rapidan Energy, told CNBC. “As we climb higher, it is a real concern.”

GasBuddy’s head of petroleum analysis, Patrick De Haan, warned that diesel at these levels will be a “silent killer” for the economy. “There’s sticker shock there for consumers,” he said.

Unlike gasoline, diesel demand is less elastic. Households can choose to drive less when pump prices spike, but there are far fewer immediate substitutes for the trucks and trains that carry freight. That dynamic helps explain why diesel has cost more than gasoline in the U.S. for decades — and why this latest spike carries outsized economic weight.

Supply squeezed from every direction

The price climb traces back to late February, when the U.S. and Israel launched strikes on Iran and Tehran retaliated by choking off the Strait of Hormuz, the waterway through which more than 20% of the world’s oil trade passes. Prices cooled briefly in early summer amid hopes for peace talks, then resumed their climb as fighting escalated again.

The supply squeeze has been compounded by a second front: Ukraine’s strikes on Russian refineries, which forced Moscow to ban diesel exports. Iran and its Houthi allies have also struck the refineries of U.S. Gulf allies.

Together, the wars have shut down refineries with roughly 5 million barrels per day of capacity, according to Valero Chief Operating Officer Gary Simmons. Andy Lipow of Lipow Oil Associates estimates the world has lost nearly 8% of its diesel supply, with little spare refining capacity to fill the gap.

“U.S. refineries are running at 98% utilization rates — there is just no spare capacity,” Helima Croft, head of global commodity strategy at RBC Capital Markets, told CNBC.

Prices vary sharply by region. California, the nation’s biggest agricultural state, saw diesel reach $7.98 a gallon — the highest in the country. Internationally, the pain is even more acute in developing nations that rely on Middle East imports: diesel prices in Nigeria have surged more than 90% since late February, followed by nearly 87% in Indonesia and 80% in Lebanon, according to Al Jazeera. Hong Kong recorded the highest sticker price at $17.78 a gallon.

The grocery aisle feels it next

Because diesel touches every link in the food supply chain, higher fuel costs tend to surface first in the grocery aisle — particularly for perishable items that must be hauled and restocked frequently.

Fuel accounts for roughly 15% to 30% of the total cost of food, according to the Independent Grocers Alliance, a group of 7,500 global supermarkets. In July, overall U.S. grocery prices were up 2.7% year-over-year, but seafood prices were up 7% and fresh fruit 4.9%, noted David Ortega, a professor of food economics and policy at Michigan State University.

The pass-through takes time. “Early on, much of the cost increase gets absorbed along the supply chain through existing freight contracts and retailer margins,” Ortega told NPR. “But as contracts reprice and fuel surcharges take hold, more of that cost makes its way to the grocery store.”

The effects are already visible beyond groceries. In April, Amazon rolled out a temporary 3.5% fuel and logistics surcharge on some third-party sellers, while UPS, FedEx and the U.S. Postal Service added fees on some packages. Clothing, cosmetics and furniture — all moved through diesel-powered networks — could see further increases the longer prices stay elevated.

A political liability heading into November

The spike is landing less than two months before midterm elections, and it is striking hardest in states that voted for President Donald Trump in 2024. Federal Highway Administration data shows diesel accounted for 55.45% of highway fuel use in Wyoming and 47.37% in Alaska, with more than 30% in each of the 15 most diesel-intensive states. Trump carried 13 of those 15 states.

The politics are uncomfortable for the White House. A late-August Reuters/Ipsos poll found 47% of registered voters named the cost of living as their top midterm issue, and 71% of adults disapproved of Trump’s handling of it, as Newsweek reported.

Trump, who has repeatedly sought to downplay the war’s economic fallout, acknowledged this week that oil prices likely won’t come down until after the November vote. He has also floated renaming the Strait of Hormuz the “Trump Strait” and proposed a tariff-funded dividend for American adults. Vice President JD Vance has claimed Iranian control of the strait is “effectively gone,” though Iran disputes that, and traffic through the waterway remains far below pre-war levels.

What to watch

Some context is worth keeping in mind. Adjusted for inflation, diesel has been more expensive before: the 2022 record of nearly $5.82, set after Russia’s invasion of Ukraine, would equal about $6.56 today. On a raw, unadjusted basis, however, Americans have never paid more at the pump for diesel than they are paying now.

The outlook offers little relief. S&P Global Energy said this week it no longer projects Middle East crude production to return to prewar levels by the end of 2027.

“The market is not returning to calm, it is adjusting to the new normal,” said Jim Burkhard, the firm’s vice president and global head of crude oil research.

With no spare refining capacity and two active conflicts constraining supply, analysts expect diesel prices to stay elevated — and with them, the cost of the food, packages and goods that flow into American homes. How voters weigh that reality in November may determine how long the political fallout lasts.