Diesel Surges While Spot Rates Fall: Trucking Market Divergence Explained

The trucking market is experiencing a fundamental disconnect between diesel fuel prices and spot freight rates, a divergence that challenges conventional assumptions about cost-pass-through mechanisms. Since early July, diesel prices have climbed steadily while spot truckload rates have moved in the opposite direction, a phenomenon driven by supply-and-demand dynamics rather than fuel cost movements. Ukrainian drone strikes targeting Russian refinery infrastructure have pushed the crack spread (the margin between crude and diesel) to all-time highs, creating significant upward pressure on pump prices with little near-term relief expected. Underlying this market dislocation is a structural shift toward intermodal rail for longer hauls.

With intermodal priced at approximately 34% below equivalent truck moves, shippers are increasingly routing cargo via Norfolk Southern and CSX, particularly across the eastern United States. This modal shift has compressed average truck length of haul to 463 miles, a sharp decline that concentrates remaining truckload volume on shorter, less profitable lanes. Tender rejection rates hover around 13.5%, reflecting carrier reluctance to accept loads at rates insufficient to cover rising fuel costs and operational pressures. For supply chain professionals, this environment presents a critical strategic challenge: carriers operating in the spot market face severe margin compression, while contract-based operators benefit from relative stability.

The anticipated peak season of October–November 2025 is projected to be more muted than historical norms, as importers have already accelerated freight movements earlier in the year via intermodal routing. This suggests a "slow and steady" demand environment rather than the traditional surge, requiring shippers to recalibrate capacity planning and procurement strategies.