Diesel Prices Surge Past $6 a Gallon, Driving Up Grocery and Transport Costs
The U.S. national average for diesel hit a record $6.05 per gallon, up from $3.70 a year ago, as the war with Iran disrupts global fuel flows. The surge is raising transportation costs for perishable groceries and prompting fuel surcharges across freight and delivery networks.
Diesel prices in the United States have climbed past $6 a gallon for the first time, setting a new record as the war with Iran disrupts global fuel supplies. The national average reached $6.05 on Friday, up from $5.85 a week earlier and $3.70 at the same time last year, according to AAA. The spike is rippling through the economy, raising transportation costs for a wide range of everyday goods and putting particular pressure on the grocery aisle.
Diesel powers much of the nation’s freight and delivery infrastructure, from long-haul trucks and trains to farm equipment and fishing boats. Because fuel accounts for roughly 15% to 30% of the total cost of food, according to the Independent Grocers Alliance, higher diesel prices often translate into more expensive groceries. Perishable items such as meat, produce and seafood face the most immediate strain because they must be hauled and restocked frequently, and in some cases harvested using diesel-powered machinery.
Some of those costs are already reaching consumers. Amazon introduced a temporary 3.5% fuel and logistics surcharge on certain third-party sellers in April, while UPS, FedEx and the U.S. Postal Service added fees on some packages earlier in the war, citing rising fuel costs. Economists warn that the longer diesel remains expensive, the more those costs will make their way to store shelves. David Ortega, a professor of food economics and policy at Michigan State University, explained that early increases are often absorbed through existing freight contracts and retailer margins, but as contracts reprice and fuel surcharges take hold, more of the burden shifts to shoppers.
The surge in diesel prices is tied directly to crude oil, which has renewed its climb as fighting between the U.S. and Iran escalates. This week, both Brent and U.S. crude surpassed $100 a barrel for the first time in months. American diesel prices are now more than 60% higher than before the U.S. and Israel attacked Iran in late February, when the national average was about $3.76 per gallon. Supply chain disruptions across the Middle East, including tanker traffic bottlenecks in the Strait of Hormuz, have compounded the problem. On Friday, the International Energy Agency reported that Saudi oil production fell to a three-decade low last month due to Houthi attacks on its energy facilities. Losses in the Middle East have been amplified by the war in Ukraine, where disruptions to Russia’s refining system have nearly halted product exports.
Regular gasoline has also risen, hitting $4.29 a gallon on average Friday, up from $2.98 before the Iran war, though still below the 2022 peak of nearly $5.02. Diesel has been more expensive than gasoline in the U.S. for decades, partly because demand is less flexible and the fuel is central to global commerce. While households can drive less when gasoline prices rise, there are fewer immediate substitutes for the networks that rely on diesel to haul goods worldwide.
Adjusted for inflation, fuel prices have been higher in the past. Ahead of the 2008 financial crisis, diesel hit about $4.74 a gallon, equivalent to $7.20 in 2026 dollars. The 2022 record of nearly $5.82 would be about $6.56 this year when accounting for inflation. Even so, the current spike is already bringing ripple effects for the economy and the wider cost of living. President Donald Trump, who has repeatedly downplayed the effects of the war he co-launched, said oil prices likely won’t come down until after November’s midterm elections.
In July, overall U.S. grocery prices were up 2.7% compared to a year prior, but seafood prices rose 7% and fresh fruit prices climbed 4.9%. Ortega cautioned that other factors can influence prices—lettuce, for example, saw higher transportation costs but a drop in demand due to a cyclospora outbreak pushed prices down. Beyond food, diesel-powered networks also transport clothing, cosmetics and furniture, meaning the pain could spread across the retail sector. Experts warn that price hikes could mount the longer diesel remains expensive, with ramifications extending well beyond consumer goods.
