Tariffs meet fuel squeeze

U.S. manufacturers are facing two pressure points at once: aluminum imports got hit with steeper tariffs in April, while diesel prices jumped to $5.64 a gallon on April 6. (whitehouse.gov; eia.gov) The White House said last week that articles made entirely or almost entirely of aluminum now face a flat 50 percent tariff on full value, while many derivative aluminum goods face 25 percent. The administration tied the move to earlier Section 232 aluminum actions issued on February 10, 2025. (whitehouse.gov; whitehouse.gov) The United States was already reliant on foreign aluminum before the latest tariff change. The United States Geological Survey estimated net import reliance at 47 percent of apparent consumption in 2024, with primary aluminum output at 670,000 tons and imports of crude and semimanufactures at 4.8 million tons. (usgs.gov) Aluminum is not a niche input. The United States Geological Survey said transportation used 36 percent of domestic aluminum consumption, packaging 23 percent, building 14 percent, and electrical applications 9 percent. (usgs.gov) Diesel is the other bottleneck because it moves the system that moves everything else. The Energy Information Administration says diesel powers most freight trucks and trains and most farm and construction equipment in the United States. (eia.gov) The Energy Information Administration said U.S. on-highway diesel averaged $5.643 a gallon on April 6, up 24.2 cents in one week and $2.004 higher than a year earlier. West Coast diesel averaged $6.924 a gallon, and California was at $7.567. (eia.gov) The same agency says distillate fuel, the petroleum category that includes diesel, accounted for about 2.98 million barrels a day of transportation use in 2022, or about 125 million gallons a day. That was about 75 percent of total U.S. distillate consumption. (eia.gov) Agricultural shippers track diesel especially closely because fuel surcharges feed straight into truck and rail bills. The United States Department of Agriculture’s Open Ag Transport Data site says the Energy Information Administration’s weekly diesel survey is a key benchmark for those surcharges. (usda.gov) The Trump administration argues the metal tariffs protect domestic production and national security. Import-dependent manufacturers and freight-heavy businesses are the ones most exposed if higher metal costs and higher fuel costs arrive in the same purchase order. (whitehouse.gov; usgs.gov; eia.gov) That is why the supply-chain warning is less about one commodity than about timing. When a factory needs imported aluminum to make goods and diesel to bring in parts and ship them out, both costs can rise in the same week. (whitehouse.gov; eia.gov; eia.gov)