Diesel's street margin is near its widest in a month

The gap between what diesel sells for at the pump and what it costs wholesale is 1.384 today, up 0.183 over the past 30 days. That is about 18 cents a gallon more room than a month ago, and it is close to the widest that spread has run in the window. If you sell diesel, your margin per gallon is working in your favor right now. If you buy it wholesale to haul or resell, the street is holding more of the value than it was in July.

Diesel itself is 5.652, up 6.4% on the month and sitting at the very top of its 30-day range. There is no cushion above today's number in recent history, so the next move higher would be new ground for the month. Petroleum inventories are 428.91, up 6.0% and about 40% of the way up their range. Supply is not tight, so it does not explain the diesel strength by itself. The strength is on the product side, not the barrel.

Gasoline is going the other way. RBOB is 3.048, down 10.3% over 30 days and only 29% up its range. That split matters if you run both grades: diesel is carrying the margin while gasoline gives it back. The 3:2:1 crack spread is 61.29, down 10.57 on the month, which fits a market where diesel holds and gasoline fades but the refiner's blended take still slips.

Natural gas is quiet by comparison. Henry Hub is 2.881, up 5.7% but only a third of the way up its range, so nothing there is pushing on your costs today.

The one to watch is that diesel spread. With diesel pinned at the top of its range, the wholesale side could catch up and pull the margin back in, so today's 18-cent gain over the month may not hold if wholesale diesel keeps climbing.