Diesel squeeze and supply chains

Diesel is not a niche fuel in supply chains; it is the fuel for the trucks, port haulers and backup generators that keep freight moving when the rest of the system looks normal. (eia.gov) In the United States, the average on-highway diesel price was $3.961 a gallon on April 6, 2026, according to the Energy Information Administration, with West Coast prices at $5.262 and California at $5.650. The same federal forecast said the national average could rise above $5.80 a gallon in April as crude and refining margins push costs higher. (eia.gov, eia.gov) Stocks matter as much as pump prices. The Energy Information Administration said in September 2025 that United States distillate inventories fell 17% in the first half of 2025, or about 22 million barrels, and warned that lower inventories increase the risk of price spikes and volatility during disruptions. (eia.gov) That matters because trucks still carry most domestic freight. American Trucking Associations said trucks moved more than 72% of United States freight tonnage in 2024, or 11.27 billion tons, and the industry paid $30.26 billion in federal and state fuel taxes in 2023. (trucking.org, trucking.org) Ports depend on the same fuel one step closer to the dock. The Environmental Protection Agency says drayage trucks are generally diesel-fueled Class 8 trucks that move containers between marine terminals, rail yards and nearby warehouses, and the Port of Los Angeles still regulates drayage access through its truck registry and clean-truck rules. (epa.gov, portoflosangeles.org) Ocean shipping adds another diesel-linked layer. The United Nations Conference on Trade and Development said more than 80% of world trade by volume moves by sea, and its 2024 review said disruptions in the Red Sea, Suez Canal and Panama Canal raised freight costs and made rates less predictable. (unctad.org, unctad.org) By mid-2024, the same United Nations report said tonnage crossing the Gulf of Aden was down 76% and tonnage transiting the Suez Canal was down 70%, while arrivals around the Cape of Good Hope jumped 89%. Longer routes increased global vessel ton-mile demand by 3% and container-ship demand by 12%. (unctad.org) Refined-fuel shipping is part of that story too. United Nations Conference on Trade and Development said tanker rates for product tankers, which carry refined fuels such as petrol and diesel, stayed high and unpredictable in 2024 because disruptions tightened available ship supply. (unctad.org) Diesel also sits in the emergency layer of supply chains, not just the transport layer. The Department of Energy lists emergency diesel generators alongside rooftop solar and batteries as distributed energy resources used to keep electricity flowing during outages, and Federal Emergency Management Agency guidance describes standby diesel generators sized to run entire facilities for multiple days. (energy.gov, fema.gov) Federal freight monitors do not show a single nationwide breakdown today. The Bureau of Transportation Statistics’ latest supply-chain dashboard, updated March 31, 2026, tracks port, rail, trucking and labor indicators, which is a reminder that diesel usually shows up as a cost and reliability problem before it shows up as an empty shelf. (bts.gov) The broad picture is less a sudden shortage than a tighter buffer. When diesel inventories run low, freight rates stay jumpy and backup systems still rely on the same fuel, supply chains can keep operating while becoming more expensive and less forgiving of the next disruption. (eia.gov, unctad.org)