Fuel Prices and Truckload Rates: Understanding the Complicated Connection

Key Details Diesel prices have surged over 41% since early March, while spot rates for dry van loads increased just 7.5% during the same period. The correlation between these two metrics stood at 0.7, suggesting they moved together fairly well. However, this relationship is not consistent - in March 2022, diesel and rates moved in opposite directions with a -0.8 correlation. Why It Matters Fuel costs represent approximately 25% of total truck operating expenses, though this percentage has declined from 28% to 21% between 2022 and 2024. Carriers cannot always pass fuel cost increases directly to shippers, making the relationship between diesel prices and rates more complex than it appears. How the Markets Differ Long-term freight contracts typically isolate fuel costs as a separate variable surcharge tied to weekly DOE diesel pricing. This shields contract rates from short-term fuel volatility. The spot market, measured by the National Truckload Index, operates differently - rates are quoted as all-inclusive totals reflecting current market conditions. The Bottom Line While fuel prices do influence truckload rates, market demand and shipper freight volume are equally critical factors. In 2022, collapsing freight demand inverted the typical fuel-rate relationship despite high diesel costs. Understanding these dynamics helps drivers and carriers anticipate rate movements beyond fuel price changes alone.