WK21 · 2026
BEHIND THE SHIELD
The national average on-highway diesel came in at $5.596/gal for the week of May 18 — a modest 4-cent drop week-over-week, but don't let that fool you. The Iran nuclear deal is stalling on two fronts: Iran declared a "Persian Gulf Strait Authority" — essentially a controlled maritime toll zone in the Strait of Hormuz — and Supreme Leader Khamenei ordered that near-weapons-grade uranium cannot leave the country. Both moves harden the standoff. WTI hit $99/barrel last week. If Hormuz stays closed, fuel costs are not coming down.
The US SPR released 10 million barrels last week — the largest single-week release on record — in a clear attempt to cap prices ahead of the holiday weekend. It bought a few cents at the pump. It did not change the structural picture. The next EIA diesel reading is delayed to Tuesday, May 27 due to the holiday. Hold FSC adjustments until then.
For shippers, the fuel story is simple: costs are elevated and the direction of the next move depends entirely on a geopolitical negotiation that is going sideways. Plan your freight budgets with $5.50–$6.00 diesel as the baseline through at least Q3.
Here's the math on Memorial Day week: five days of freight demand compressed into four business days. Monday is gone. That volume doesn't disappear — it redistributes across Tuesday through Friday, with Tuesday absorbing the heaviest load. Carriers are largely dark today. When they come back online tomorrow, the board fills fast.
Catalyst 1 — Post-Roadcheck Capacity Hangover: CVSA International Roadcheck ran two weeks ago (May 5–9). Arizona DPS reported a 33% out-of-service rate on 1,000+ inspections. National OOS hit 31.4% vs. a historical norm of 18.4%. Equipment posts dropped 12% (flatbed -20%) during the inspection week. That capacity hasn't fully returned — the hangover is still working through the system heading into this compressed week.
Catalyst 2 — Record Spot Rates Entering the Week: Reefer spot hit $3.05/mi the week of May 19 — the largest single-week spike ever recorded by DAT. Flatbed all-in hit $3.60/mi, a new all-time record that broke May 2022. Van is at $2.58/mi, up 21 cents week-over-week. These rates were already in place before the holiday. The next DAT reading drops Tuesday, May 26 — it will reflect the full weight of the compressed week.
Catalyst 3 — Month-End + Produce Season: May 31 is a Saturday, which means month-end shipping pressure lands squarely on Thursday and Friday this week. Produce season is simultaneously tightening regional capacity in the Southeast and California corridors. You have a compressed week, a tight market, and a seasonal demand surge all hitting at once.
Rates are trending ~15% above last year and are expected to stay elevated through the July 4 period. This is not a demand surge — it's a capacity squeeze. The market is reactive. Even modest disruption produces outsized rate responses right now.