Diesel Just Broke Over $6 a Gallon. Here's Why Your Grocery Bill Is About to Climb With It.
The price of diesel — the fuel that moves nearly everything Americans eat, wear, and buy — has crossed a threshold it has never crossed before. The cause traces directly back to the Iran war. And the bill for that war is about to land in your grocery cart more than it already has.
The national average price of diesel hit a record $6.45 per gallon, a 74% increase over this time last year. The ongoing U.S.-Iran war has closed off the Strait of Hormuz for much of this year, and Iran's closure of that strait — combined with the Russia-Ukraine war's disruption of refined-fuel flows — has tightened the worldwide supply of diesel to a breaking point. Americans are now spending roughly $700 million more per day on gasoline and diesel combined than they were a year ago.
Diesel is what powers roughly three-fourths of the 17 million commercial trucks on American roads, along with the trains, tractors, and harvesters that get food out of the ground and onto store shelves. "Diesel is different than gasoline; it's like the silent partner in this," Mark Finley, an energy fellow at Rice University's Baker Institute said. "It's embedded in virtually everything that's going on in our economy."
That embedding is exactly why this war-driven spike hurts even more than a gas-pump headline. Trucking companies, farms, and freight operators have no substitute — they simply absorb the cost, then pass it on.
And the math on that pass-through is brutal. When fuel costs rise 10% to 15%, retail food prices climb 2% to 4%, according to the Independent Grocers Alliance. Diesel hasn’t just risen 10 or 15%, it’s risen 74%.
Bob McNally, president of Rapidan Energy, called diesel "the real lifeblood of the economy," while Patrick De Haan of GasBuddy called today's prices a "silent killer" for the economy.
Making matters worse: as war-driven diesel costs spiral, the Trump administration has moved to roll back stringent emissions rules for trucks — rules the trucking industry itself says will cost up to $12,000 per truck to comply with. Consumer advocates say the squeeze was already underway before the Iran war sent diesel spiking. "Since early 2021, American consumers have seen their family budgets getting squeezed more and more," said David Holt, president of the Consumer Energy Alliance. "On top of the direct impact of excessively high gasoline and diesel prices, family budgets are crushed by the inflationary impact those fuel prices have on essential, everyday commodities like eggs, bread, milk and clothing — all of which require diesel fuel to get to our markets or homes. Simply put, when gasoline and diesel costs go up, the cost of everything goes up."
The full weight of this hasn't hit the shelves yet. Finley said grocery-store impact "has to work through all of the suppliers raising their prices a little bit" before it reaches customers — a lag that means the worst is still ahead, not behind. And there's no end to the war in sight to bring relief: With the fall harvest underway and holiday freight demand about to spike, the industry has roughly two months to turn this around, warned Thomas Kloza, Gulf Oil's chief energy adviser: "We've got probably about 60 days to figure this out."
For families already stretched thin, the diesel spike will only make budgets harder to manage in the coming months.
