The U.S. Energy Information Administration said this week that the nation’s stockpile of diesel fuel is on pace to fall below 100 million barrels in October, a level the country has not seen since 2003. The forecast, published in EIA’s September Short-Term Energy Outlook, means the fuel that moves nearly every truck, train and tractor in the country will stay unusually scarce heading into the fall shipping season and the winter heating months. For a household budget, that scarcity does not show up as a headline about oil markets. It shows up later, in a delivery fee, a heating bill, or a few extra cents on a gallon of milk.
A Diesel Tank the Nation Hasn’t Seen Since 2003
EIA’s forecast covers what the agency calls distillate fuel oil, the category that includes both diesel and home heating oil. In its September 9 outlook, the agency said it expects U.S. distillate inventories to drop below 100 million barrels in October for the first time in 23 years, and to stay below the 2021-2025 five-year low through the first quarter of 2027. That is not a single bad week of data. It is a projection that the cushion refiners and fuel marketers normally hold against a cold snap or a refinery outage will be thinner than it has been in a generation.
The forecast, laid out in the Short-Term Energy Outlook press release, lines up with what is already showing at the pump. EIA’s weekly Gasoline and Diesel Fuel Update put the U.S. average price for on-highway diesel at $5.967 a gallon for the week of September 7, 2026, up 36.8 cents from the week before and $2.20 higher than the same week a year earlier. Regular gasoline averaged $4.157 a gallon over that same week, so diesel is now running more than a dollar and a half above gasoline nationally, a gap that tends to widen whenever distillate supply tightens relative to gasoline supply.
The squeeze is not spread evenly across the country. EIA’s regional breakdown for that same week put West Coast diesel at $6.987 a gallon and California specifically at $7.764, while the agency’s price history shows Gulf Coast diesel averaging $5.754, a gap of more than $2 a gallon between regions. Trucking companies price fuel surcharges by lane, so a shipment routed through California costs a carrier meaningfully more in fuel than the same shipment routed through the Gulf Coast, and that regional cost difference eventually shows up in regional retail prices too.
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A Global Barrel Count Behind the Domestic Squeeze
EIA ties part of the tightness to global crude supply, not just domestic refining. The agency’s outlook says Middle East crude production has been curtailed by constraints on shipping through the Strait of Hormuz, with an average of 5.7 million barrels a day of production shut in during the fourth quarter of 2026, before most of it returns to near pre-conflict levels by the second quarter of 2027, per the full September Short-Term Energy Outlook. Brent crude averaged $91 a barrel in August, up $7 from July, and EIA expects it to hold near $90 through the rest of 2026 before easing to an average of $74 in 2027 as production recovers and inventories rebuild. The agency estimates global oil inventories have already fallen by roughly 400 million barrels so far this year.
From the Fuel Island to the Checkout Line
Diesel is the fuel of freight. The bulk of the goods that reach a U.S. store travel by truck for at least part of the trip, and fuel is typically a trucking company’s largest controllable cost after labor. When diesel jumps 37 cents in a single week, as it did in EIA’s most recent reading, carriers generally pass a share of that increase through as a fuel surcharge, which shows up weeks later as a slightly higher price on a shelf that has nothing to do with energy on its label.
Farmers face similar exposure this time of year. Diesel powers the combines, grain dryers and delivery trucks used during fall harvest, so a tighter national supply is arriving in the same weeks that agricultural diesel demand typically peaks, adding one more cost pressure on top of everything else moving through the fall supply chain.
A Second Bill Coming Due: Home Heating Oil
Distillate fuel oil is not only diesel. It is the same refined product sold as home heating oil, a fuel a meaningful share of Northeast households still rely on each winter. A national inventory running below its five-year range, and below its lowest point since 2003, gives fuel marketers less cushion to draw from if a cold snap arrives before refiners can restock. That is the scenario that has historically pushed heating oil prices up fastest in January and February, when demand peaks and supply has the least room to absorb a surprise.
What EIA Expects Once the Squeeze Eases
The same outlook that flags the near-term shortage also forecasts relief on the other side of it. EIA projects the national average retail diesel price at $5.55 a gallon in the fourth quarter of 2026, then a drop to $4.40 a gallon across 2027, as Middle East production recovers and global inventories begin to rebuild. Until that rebuild shows up in the weekly numbers, the agency’s own data says the fuel is the tightest it has been in 23 years, a fact households are most likely to meet first at the pump, and again later on a freight bill or a heating statement.
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This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
