The Real Cost Per Mile of One Semi-Truck in 2026

A van load paying $3.05 a mile (DAT, October 2026) beats break-even by about 37¢ on 2025 costs. Price fuel at $6.352 diesel (EIA, week of Oct 26, 2026) and the same load comes up about 19¢ short. We build one semi's cost per mile line by line, starting from ATRI's 2025 average of $2.336, and we put a date on every number. The rate stays at the top of an animated cost bar. Under it we stack each cost: driver pay, fuel, the truck payment, repairs, tires, insurance, tolls and permits. On paper, the $3.05 all-in rate minus the $2.336 bar leaves about 71¢ a mile. Then we price fuel at this week's diesel, using 6.5 mpg as an example, and that drops to about 22¢. Then we take out empty miles, and the load ends up roughly 9¢ a mile under water (estimate, example inputs). We use three rules. Everything is per total mile. Every number gets a date. Every comparison is like with like: all-in rates go against all-in cost, and DAT's September 2026 van, flatbed and reefer linehaul rates go against cost without fuel ($1.854). Flatbed averaged a small operating loss in 2025, but by September 2026 its linehaul rate was up about 30% from a year earlier. After that, we split fixed costs from variable costs and show why the miles you run in a year change your cost per mile so much. We work out a break-even rate that covers factoring fees and empty miles: about $2.68 per loaded mile on 2025 costs, and about $3.24 with fuel at this week's diesel. At the end you get a four-step formula to run on your own truck. Note: ATRI's figures are industry averages built mostly on fleet data, not one owner-operator's books. "6.5 mpg," "one mile in ten empty," "3% factoring" and "100,000 miles a year" are example inputs we chose to show the math. They aren't industry averages. Use your own numbers.