US diesel slipped below $5 a gallon on Wednesday, the first time since mid‑March. The American Automobile Association reported a national average of $4.98 per gallon, down from a $5.69 peak in April. The drop eases cost pressures on freight firms and manufacturers that depend on diesel for shipping and power. Trucking rates, previously near record highs, should ease as fuel costs fall.

The decline follows a retreat in crude oil prices after the US‑Iran conflict pushed the Strait of Hormuz bottleneck to historic levels. Temporary sanctions relief for Iranian crude and renewed tanker traffic have softened the feedstock cost for refiners. Meanwhile, the White House tapped the Strategic Petroleum Reserve and waived the Jones Act to curb energy inflation. Analysts note the trend may be short‑lived.

Domestic diesel inventories have fallen to the lowest seasonal levels in decades, leaving the market tight despite the price dip. Any move by Russia to halt diesel exports could reverse the gains quickly. For now, carriers and logistics firms see a modest relief in operating expenses. The inventory squeeze also pressures refiners to prioritize domestic supply over exports.