Why has the diesel retail-wholesale spread narrowed to 1.015 over the past month?
The diesel retail-wholesale spread is 1.015 now, down 0.724 over the past 30 days. A spread that moves that far in a month has one big number behind it somewhere. The question for this issue is which one.
ULSD diesel futures are 4.181, up 31.6% over the past 30 days, with a 30-day high of 4.496 and a low of 3.093. Those futures are the wholesale side of the spread, and they ran hard. A product price that climbs by roughly a third in a month can pull a spread around by itself, so the wholesale number is where I started.
Crude sits behind that wholesale run-up. Brent is 96.78, up 31.2% over 30 days. WTI is 89.31, up 27.0%. Diesel and Brent moved almost the same distance over the same month, which tells me the wholesale diesel jump is mostly a crude jump passed straight into the product. Refiners paid more for the barrel and the rack price followed.
When wholesale climbs by about a third in a month, retail pump prices tend to lag the rack. So the spread narrowed because wholesale outran retail. The retailer's margin thinned while the rack was still climbing under it. That accounts for the direction of the 0.724 drop without needing anything more exotic than a wholesale price moving faster than a retail one.
RBOB gasoline is 3.396, up 17.8% over 30 days. Diesel outran gasoline by a wide margin over the same window. So the run-up was not a general lift across every product. Distillate took the bigger bid, and diesel is the leg of the barrel that moved the retail-wholesale math the most. If the whole product complex had risen the same amount, I would weigh a broad crude story more heavily, but gasoline rising less than half as fast in percentage terms points at something specific to distillate demand or distillate supply. The wire did not give me the reason for that, which I will come back to.
The 3:2:1 crack spread is 64.3 now, up 9.48 over 30 days. The crack is the refiner's margin between crude in and products out, and it widened while the retail diesel margin narrowed. Both facts sit in the same month. The refiner earned more per barrel of throughput at the same time the retailer earned less per gallon at the pump. So the margin did not vanish. It moved up the chain, from the retail counter toward the refinery gate. A refiner running distillate-heavy this month had a good month for it, and the crack number says so plainly.
Henry Hub natural gas is 2.871, down 10.9% over 30 days, with storage at 99.776, up 10.8%. Gas fell while crude and products rose. Two things follow. First, the run-up was not energy-wide. It was a crude and refined-products move, not a lift in everything that burns. Second, natural gas is a refinery input and a refinery fuel, so a lower gas price holds refining costs down while product prices climb, and that is part of why the crack could widen to 64.3. Cheaper gas on the cost side, pricier distillate on the revenue side, and the refiner margin opens up.
Put together, the picture is fairly clean. Crude ran up about a third in a month. Wholesale diesel followed almost exactly. Retail pump prices lagged the rack, the way they usually do when wholesale moves fast, and the retail-wholesale spread compressed by 0.724 to 1.015 as a result. The margin that left the retail counter did not disappear. It landed further upstream, where the crack spread widened to 64.3 and lower gas costs helped it along. For this month, the refiner earned the better end of the diesel barrel and the retailer carried the thinner one. Both are doing the same job they always do. The price moved faster than the retailer could reprice, and the numbers show where the gap went.
What I am sure of: wholesale diesel outran retail on a crude-led run-up, that is what narrowed the spread, and the refiner margin widened over the same window. What I am not sure of is what happens next. Retail street prices usually catch up to the rack with a lag, and if they do, the spread could rebuild from 1.015 as pump prices reset higher. I would not call the timing, and I would not call the direction of crude from here. The one diesel headline on the wire this cycle was about the technician-hiring gap, nothing on distillate demand or a refinery outage, so I cannot confirm from reporting why diesel specifically took the bigger bid over gasoline. That part I am still watching.
And that was just the data. See you tomorrow.