Why has ULSD diesel futures climbed 15.2% in a month?
ULSD diesel futures are 4.959 a gallon, up 15.2% over the past thirty days. A working fleet owner already feels that at the rack, and the question is plain: what is actually pushing the number, and is it the kind of thing that eases off or the kind that stays. I went through the benchmarks one at a time to see where the move is really coming from.
Crude was the first place to look, because diesel is made from it. WTI is 100.05, up 20.2% over the same thirty days. Brent is 104.61, up 17.6%. Both rose more than diesel futures did. The obvious read is that diesel is leading the whole complex higher, but the numbers say the opposite order: crude climbed first and climbed further, and diesel followed it up by less. So most of the 15.2% is the cost of the barrel going in, not something happening only to diesel.
The crack spread backs that up. The 3:2:1 crack is 61.98, down 3.31 over the month. If diesel were the tight spot pulling the market, refiner margin on the three-barrel basket would be widening. It narrowed instead. Refiners are paying more for crude than they were a month ago, and the products they sell have not risen enough to keep the margin where it was. A refiner running that basket had a worse spread this month than last, even with diesel at 4.959. The rise in diesel is being paid for up front in the crude bill.
Gasoline is where the move stops looking like a general fuel story. RBOB gasoline is 3.307, up 4.9% over the thirty days. Diesel is up 15.2% over the same window. Gasoline stayed nearly flat by comparison while diesel ran. Whatever is tightening is tightening the distillate side specifically, not every gallon that comes out of a refinery. That narrows the question a lot. It is not just expensive crude lifting everything at once, because if it were, gasoline would have come along for more of the ride.
So the distillate side has its own squeeze sitting on top of the crude move. The wire points at capacity. The White House is weighing the Defense Production Act to add refining capacity, with American refineries already running at 98%, according to the Reuters account of the refiner meeting. A plant at 98% cannot make much more diesel no matter what the futures screen says. When crude goes up and the refineries that turn it into diesel are already maxed out, the product price has nowhere to go but up, and there is no spare unit to bring on that would pull it back down. The same reporting ties the crude move to the Middle East war. European Commission data in the wire has EU diesel up 33% since the fighting began, faster than gasoline there too, which is the same distillate-led pattern showing up on the other side of the Atlantic.
Retail is where operators actually pay, so I checked it last. The U.S. diesel price is 5.967 a gallon, up 13.5% over thirty days, and the thirty-day high is that same 5.967, meaning the retail number is at its top right now. The wire has the national average crossing $6 a gallon for the first time, with AAA putting the Scranton-Wilkes-Barre-Hazleton area at 6.31 on Friday. The retail-wholesale diesel spread is 1.3, up 0.233 over the month. That widening matters: retail did not just track wholesale up, the gap between them grew by 0.233. Part of what a fleet pays at the pump this month is the crude and the product tightness, and part is a retail-to-wholesale gap that is wider than it was, which is the distribution and retail layer carrying its own cost of moving fuel in a tight market.
Putting it together, I am fairly sure of the shape of it. The 15.2% in ULSD futures is mostly crude, and crude led diesel rather than the other way around. On top of the crude move there is a real distillate-specific tightness, visible in diesel running while gasoline stayed put and in refineries already at 98%. The crack spread falling tells me refiners are not the ones gaining from this particular month; their basket margin compressed even as the product got more expensive, because the crude under it got more expensive faster. The people earning a wider margin here, by the one number I have, are at the retail-to-wholesale step, where the spread opened up by 0.233, and that is a fair return for keeping fuel flowing when it is hard to source.
What it means for an operator is harder to call, and I will not pretend otherwise. Wholesale diesel is up, retail is at its thirty-day high of 5.967, and the retail gap is wider than a month ago, so the cost per mile is up now and is real. Whether it holds depends on things the data here cannot settle: how long crude stays above 100, and whether the refinery capacity question the White House is discussing changes anything, which on its own timeline it would not for a good while. With plants at 98% and crude elevated, I do not see an obvious pressure valve in these numbers that brings diesel back down soon. A fleet that can lock in forward coverage may want to, and I would not count on relief I cannot point to in the data.
And that was just the data. See you tomorrow.