U.S. diesel is 6.529 a gallon, the top of its 30-day range

Retail diesel is 6.529 a gallon, at the high end of its 30-day range and up 15.5% over the past month. It rose more than any other price on this page, and no other benchmark is sitting at the top of its range.

The diesel retail-wholesale spread is 1.639. Retail rose 15.5% while ULSD futures, the wholesale side, rose 10.0%. Gasoline is close behind diesel, at 4.61 and 99% of its own range, so both fuels are near the top at the same time. Crude sets the backdrop: Brent is 104.32, up 18.8% and at the 88% mark of its range, and WTI is 92.41 at 64%.

The one thing pointing the other way is the 3:2:1 crack spread, the refiner's margin on turning a barrel into product. It is now 68.19, down 2.18 over the month, and it tightened while your retail margin widened. If crude holds up here and the crack stays under pressure, wholesale diesel could firm up from the refining side and start to eat into that cushion, though the timing on that is not something today's numbers pin down.