Forget Gasoline — This Overlooked Fuel Is Quietly Raising the Price of Almost Everything You Buy

While gasoline prices grab most of the headlines, diesel is emerging as the Iran conflict’s potentially bigger economic threat to everyday Americans.

Diesel powers the trucks, farms, freight trains, and heavy equipment that move nearly every product through the U.S. economy. Prices have climbed from an average of $3.56 a gallon in January 2025 to $5.13 since the conflict began, according to the Energy Information Administration.

A fully loaded semitruck typically gets only 6 to 7 miles per gallon. Filling its roughly 250-gallon tanks can now cost more than $1,280. Those higher transportation costs ripple into groceries, home construction materials, and online deliveries.

“We all focus on gasoline because, ultimately, we’re consumers and pump prices are very visible. But what we don’t think about is the price of diesel, which is the workhorse fuel for the U.S. economy,” said Bernard Yaros of Oxford Economics. He specifically flagged concerns for food prices, noting diesel powers irrigation, tractors, and the trucks that move produce from farms to stores.

An energy industry source attributed most of the recent diesel surge to the Iran conflict and disruptions around the Strait of Hormuz, through which roughly 20 million barrels of oil pass daily. Even if tensions ease, prices may stay elevated for a time because of refining and supply lags.

The result is higher costs that can continue working their way through the economy long after Middle East headlines fade, leaving consumers paying more for a wide range of everyday goods.