Diesel Hits $6 a Gallon for the First Time Ever, and Your Grocery Bill Will Feel It

A Historic and Painful Milestone at the Pump

U.S. diesel prices crossed over the $6 per gallon mark on Friday, September 12, for the first time on record, as global conflict roiled the energy complex and sent prices on oil products soaring. The national average of $6.05 was up from $5.85 the previous week and $3.70 this time last year, according to motor club AAA. For most American drivers, diesel is an afterthought — something for big rigs, not passenger cars. But that assumption is exactly why this record matters so much.

Diesel prices are closely watched due to the fuel's role as the so-called "workhorse" of the global economy, powering everything from U.S. 18-wheeler trucks to home heaters in the Northeast, hospital generators, and construction equipment. The price point may be invisible to most American drivers, but will likely lead to higher costs for most things consumers buy.

The Iran War Is Driving the Surge

American diesel prices are now significantly higher than they were before the U.S. and Israel launched their war against Iran in late February, when the national average sat at about $3.76 per gallon. Prices quickly climbed as the cost of crude oil soared amid supply chain disruptions across the Middle East, notably with most tanker traffic bottlenecked in the key Strait of Hormuz. Despite prices cooling some during hopes for peace earlier in the summer, oil renewed its climb as fighting once more escalated.

The problem is two-fold: first, oil futures surged back above $100 a barrel as the U.S.-Iran war dragged on. Second, there aren't enough refineries operating to turn that crude into fuel. Refineries in the Middle East and Russia have been damaged by war, and Russia — a major source of diesel — has limited its exports to fight fuel shortages at home. Ukraine also launched attacks targeting Russia's vital oil sector, with the Ukrainian military reporting a strike on a refinery in Siberia, causing fuel shortages inside Russia.

What It Means for Your Wallet

KPMG chief economist Diane Swonk put it plainly: "The cost of diesel gets into just about everything," from running a farm to the cost of food and "everything across the economy that's shipped." When diesel prices rise, everything "gets that extra fee tacked onto it." Swonk predicted that the high cost of diesel will be an "inflationary problem" for months to come.

Some businesses have already passed along steeper costs to consumers in the form of added fees on online orders and packages in the mail, and shoppers may feel more and more sticker shock, particularly in the grocery aisle. Combine harvesters, tractors, and heavy transport trucks all need large amounts of diesel, and there is no alternative. Farmers must move all of their products from the farm to the grocery store shelves, so they have to pay for that extra cost, no matter how much it is.

No Easy Off-Ramp in Sight

Diesel prices are up by roughly 55% since the United States and Israel launched strikes on Iran in February, and the fuel is on pace to record the largest annual percentage increase of all time this year. The record came just ahead of peak demand season for diesel, raising the risk of further energy-driven inflation. In California, prices were already near $8 a gallon.

The administration has tried to stanch the bleeding — directing a massive release of oil from the Strategic Petroleum Reserve, easing restrictions on which ships can carry fuel, and reducing sanctions on Russian and Iranian oil — but all of these measures are arguably already priced into the market, and it isn't clear there are more levers to pull in the short term. An end to the conflict could lower prices within weeks, but "every week that this goes on, we could see another 25 to 40 cent increase," according to one energy analyst. With no ceasefire on the horizon, the $6 gallon may soon look like the good old days.