Diesel Hits a Record $6.53 a Gallon, Up 77% in a Year

Diesel fuel in the United States has hit a record high of $6.53 per gallon, up roughly 77% from the $3.69 average a year ago, according to AAA data cited in a new analysis of the fuel market.

Regular unleaded gasoline is also expensive, averaging around $4.50 per gallon, but diesel has come to dominate the news cycle for a simple reason: it is one of the most important cost inputs in the broader economy. Diesel powers heavy-duty trucks, tractors, ships and locomotives, among other machinery, effectively underpinning some of the largest industries in the world. When diesel costs climb, overall costs climb, and those increases cascade into goods and services.

The math is unforgiving at the farm gate. If the cost of fueling a tractor rises 77% in a year, the cost of the goods that farm produces rises too. For businesses that straddle a thin line between profit and loss, a price hike of that magnitude could be a death knell.

Farmers are already sounding the alarm. "High diesel prices ARE KILLING FARMERS INCOME," Republican Sen. Chuck Grassley of Iowa recently posted on X. The likely end result, according to the analysis: pretty much everything becomes more expensive.

What is driving the spike

The price of diesel is largely determined by the price of crude oil, distribution and retail costs, and refinery margin, according to the U.S. Energy Information Administration (EIA). Diesel prices track crude, but they are not the same thing.

Crude prices have risen this year mostly due to bottlenecks in the Strait of Hormuz related to the war in Iran. Diesel is a petroleum byproduct: on average, a 42-gallon barrel of crude yields 11 to 12 gallons of diesel, according to the EIA.

Refining capacity is the second pressure point. Lower refining activity in parts of the Middle East and in Russia has reduced supply. Middle East diesel exports to Europe are at a six-year low, per S&P Global Commodity Insights data cited in the report. Military operations and ongoing conflicts in Iran and Russia, which is fighting Ukraine, have damaged refineries and infrastructure in both countries.

The damage in Russia is extensive. President Volodymyr Zelenskyy of Ukraine recently said his country has destroyed 45% of Russia's refinery capacity.

Inventories compound the problem. Diesel stockpiles have fallen significantly since the start of the war in Iran, leaving less fuel on hand and increasing demand for production and refinement — the very output that is being constrained.

Will prices keep rising?

In the near term, prices for many goods and services — if not most — are likely to rise or remain elevated due to high diesel costs. The analysis expects diesel prices are unlikely to come down quickly or anytime soon.

Washington is floating fixes. The White House and members of Congress have discussed a ban on diesel exports, which would keep fuel refined or produced in the United States at home. Rep. Tim Burchett, a Tennessee Republican, has introduced legislation that would ban diesel exports through early next year, and President Trump is reportedly considering restrictions, according to The Wall Street Journal.

A ban alone likely will not solve the problem. The root causes of the spike are higher crude prices and lower refining capacity, and U.S. diesel inventories are already low. Short of the conflicts in Russia and Iran easing, there is no clear or easy solution.

For now, consumers should brace for higher costs across the board — from the gas station, where diesel-powered trucks deliver unleaded gasoline to retail pumps, to the grocery store.