Why has the U.S. diesel price climbed 4.7% over the past month?
The U.S. diesel price is 5.599 a gallon, up 4.7% over the past thirty days, with a high of 5.652 and a low of 3.459 across that window. For anyone buying fuel by the truckload, the question is what pushed it there and whether the move is close to done.
The first place to look is crude, because most of what a gallon costs starts as a barrel. WTI is 93.91, up 19.1% over the same thirty days. Brent is 98.68, up 16.8%. Both climbed roughly four times as much as retail diesel did. If crude were passing straight through to the pump, retail would be up far more than 4.7%.
Diesel comes off a barrel as a refined product, so the closer read is the wholesale contract. ULSD diesel futures are 4.667, up 17.8% over thirty days, with a high of 4.682 that is near where they trade now. Wholesale diesel rose almost as much as crude did. The rack price a distributor pays moved in the same big step as the barrel. Retail did not.
The gap between those two numbers is the whole puzzle. Upstream, crude and wholesale diesel each rose somewhere around a sixth to a fifth over the month. At the pump, diesel rose 4.7%. Retail is lagging what it buys, and by a wide margin.
The retail-wholesale spread tells you where that lag went. It is 1.104 now, down 0.367 over thirty days. That spread is the retailer's gross margin over the rack, and it compressed hard this month. Distributors and stations paid a lot more for wholesale diesel and passed only part of it to the pump. The rest came out of their own margin. Retail diesel rose slowly because the people selling it absorbed a chunk of the wholesale jump rather than moving the sign every morning. That is normal near the top of a fast move, when pump prices trail the rack by days or weeks, and it means the retailer carried the cost this month while the buyer got a slower climb than the barrel would suggest.
Refiners sit on the other side of that. The 3:2:1 crack spread is 57.26, down 3.63 over thirty days. Crude rose faster than the products made from it, so the margin on turning three barrels of crude into two of gasoline and one of diesel narrowed. The crack is still a healthy number by historical standards, so refiners are running a good margin. It just eased this month because the barrel outran the product.
If crude is up 19.1% and wholesale diesel is up 17.8%, the next thing to check is whether supply is actually short or whether this is a price move looking for a reason. U.S. petroleum inventories are 424.46, up 4.3% over thirty days, off a high of 465.729 and above the low of 404.508. Inventories rose. On the domestic barrel count, there is more oil in the system than a month ago, which cuts against a simple shortage story for crude itself.
Diesel is a different market from crude, and the wire is where the tightness shows. Vitol's chief executive told an Asia-Pacific conference the market is missing about 2 million barrels a day from Russia and close to 2 million a day from the Middle East, and Reuters reports refining executives expect global diesel supply to stay tight into next year for lack of capacity to make up the difference. That is a product problem, not a crude problem. Refineries that could turn extra barrels into diesel are the missing piece, which fits what the crack spread and the inventory number say together: crude is available, the capacity to refine it into distillate is not.
The rest of the wire lines up with a market near its ceiling. One outlet reports diesel hit an all-time high going into Labor Day. Another has the U.S. price nearing 5.86 a gallon in local coverage, above the 5.599 our desk shows and above the 5.652 thirty-day high, so some regions are already running hotter than the national number. An industry source quoted by The Business Journals expects diesel to get worse before it gets better. None of that is a forecast I can stand behind, but it points the same way the spreads do.
The answer: retail diesel is up 4.7% because it is trailing a much larger move in crude and wholesale diesel, both up around a sixth to a fifth, and retailers absorbed part of that jump into a margin that shrank by 0.367. The wholesale move traces to tight distillate supply from lost Russian and Middle Eastern refining runs, per the reporting. It is not a crude shortage. U.S. inventories rose 4.3% over the month.
What it means for a fuel operator is the uncomfortable part. The 4.7% at the pump understates the pressure already in the barrel and the rack. If wholesale holds anywhere near 4.667, retail has room to keep climbing as the lag closes, and the compressed retail spread says stations have little cushion left to keep eating it. I cannot tell you how much passes through or when. I can tell you the pump has not yet caught up to what diesel already costs upstream.
And that was just the data. See you tomorrow.