Why did the diesel retail-wholesale spread narrow to 1.104 this month?
The diesel retail-wholesale spread is 1.104 now, down 0.367 over the past thirty days. The spread is the gap between what a station charges at the pump and what the fuel cost coming off the rack, and it moved a third of a point in one direction in a month. When a margin that operators live on moves that far that fast, the useful question is what pushed it and where the money went instead.
The retail price of diesel is 5.599, up 4.7% over thirty days, with a high of 5.652 and a low of 3.459 in that window. So the pump number went up, not down. A narrowing spread with a rising retail price rules out the simple story where stations cut prices and gave up margin. They raised prices and the margin still shrank, which means the cost side rose faster than they could pass through.
ULSD diesel futures are 4.54, up 19.6% over thirty days, off a low of 3.093 and a high of 4.682. Those futures are the wholesale side, the price closest to what a marketer pays before it reaches the station. Wholesale climbed about four times as fast as retail over the same month. When the cost you buy at rises far quicker than the price you sell at, the space between them closes, and that is the whole of what the spread number is reporting.
Crude explains most of the wholesale move. WTI is 91.48, up 21.6% over thirty days, with a high of 108.66 and a low of 68.25. Brent is 96.28, up 21.2%, high 112.1, low 71.57. Both benchmarks moved more than twenty percent in a month, and diesel is made from crude, so a jump of that size on the barrel feeds straight into the rack price for ULSD. The wholesale climb is not a refining event on its own. It is crude pulling the product up with it.
If crude were the entire story, refiners would be passing through a higher cost and holding their own take flat. The 3:2:1 crack spread says otherwise. It is 62.09 now, up 4.68 over thirty days. That spread is the rough measure of what a refiner earns turning three barrels of crude into two of gasoline and one of distillate, and it rose while crude rose. Refiners are not just moving a bigger cost along. They are keeping a wider gross margin on the barrel than they were a month ago. Some of the money that left the retail-wholesale spread landed here.
Gasoline moved less than diesel, which sharpens the point. RBOB is 3.215, up 13.2% over thirty days, high 3.761, low 2.756. Gasoline rose, but by less than diesel and by less than crude. The distillate side of the barrel is where the strength is this month, and a refiner weighted toward diesel output would feel the crack widen more than the blended 62.09 shows. Diesel is doing the pulling. The wire has one plain confirmation of the pump end of that, a Philenews headline that fuel prices are surging again as diesel nears record highs. It names the direction. It does not tell me the margin.
Natural gas is the one benchmark that stayed comparatively calm. Henry Hub is 2.975, up 10.7% over thirty days, high 3.343, low 2.64. Gas is a real refining input on the cost side, for hydrogen and process heat, and its rise is the mildest of the group. So refiners caught a smaller increase on that input while the product they sell rose harder, which is consistent with the crack widening rather than narrowing. It is a small supporting number, not the driver.
The biofuels items on the wire do not bear on this month's spread. JBS running a truck 500,000 kilometers on B100 from beef tallow and used cooking oil is a real story about feedstock, and Buffalo Biodiesel warning that cooking oil theft is rising tells you those feedstocks have value. Neither one explains a thirty-day move in the U.S. diesel rack. I checked them because diesel and freight is one of the most-covered sectors on our wire over the last fourteen days, at 1,008 items, behind prices at 2,042. Coverage volume is not price pressure. I set them aside.
Where the margin landed is the part I can state with some confidence. The retail-wholesale spread fell because wholesale diesel rose about four times faster than retail, and wholesale rose because crude rose more than twenty percent. Over the same window the crack spread widened, so refiners held a better gross margin on the barrel than a month ago. The retailer is carrying the cost of the fast wholesale climb and has not fully passed it to the pump, which is the ordinary lag when the rack moves this quickly. That lag could close if crude steadies and stations catch up, or the spread could stay thin if the barrel keeps climbing. I would not call the direction from here.
What I am sure of is the mechanism. The spread narrowed because of what happened above it, at the rack and on the barrel, not because of anything a station did at the pump. What I am not sure of is how long the retail side stays behind, because that depends on where crude goes next, and 91.48 after a 21.6% run is not a number I will predict off.
And that was just the data. See you tomorrow.