Ask what a mile costs and it is tempting to answer with a fuel number. Fuel is the most visible cost, it moves weekly, and it is the one you physically stand next to. In the worked week below it is 60 cents of a $1.90 mile.
A cost per mile you can actually negotiate against has four parts. Three of them are easy to find in your own paperwork. The fourth is the one that gets left out, and it is the reason a fleet can run busy all year and end up with nothing.
1. Fixed costs — what you pay whether the truck moves or not
These do not care how many miles you run. Pull twelve months of them and divide by twelve to get a monthly figure:
- Truck and trailer payments
- Insurance — liability, cargo, physical damage, occupational accident. The liability floor is not optional: a for-hire carrier hauling general freight interstate in a vehicle rated 10,001 pounds or more must hold at least $750,000 of public liability (§ 387.9).
- Permits, licensing, IFTA, UCR, heavy vehicle use tax
- ELD and TMS subscriptions
- Accounting, legal, and any back-office help you pay for
- Parking, yard, or terminal fees
The trap here is annual costs. Insurance renewals and permit fees arrive once a year and feel like events rather than costs. Divide every annual bill by twelve and put it in the monthly column, or your cost per mile will look great for eleven months and inexplicable in the twelfth.
Fixed costs also cannot be spread over unlimited miles. A driver may not drive after 60 hours on duty in any 7 consecutive days, or 70 hours in any 8 consecutive days if the carrier runs trucks every day of the week (§ 395.3), so each truck has a ceiling on the miles it can carry those costs across.
2. Variable costs — what each mile adds
These scale with the odometer. The reliable way to get them is not a per-mile estimate but a twelve-month total divided by twelve months of actual miles:
- Fuel and DEF
- Tires — including the ones you have not bought yet; a tire has a mileage life, so it is a per-mile cost even when you paid for it in one lump
- Preventive maintenance and repairs
- Tolls and scales
- Driver pay, if you are paying one
3. Your own pay
This is the one that gets left out, and leaving it out is what makes a bad rate look acceptable.
If you drive, you are a driver, and a driver is a cost. If you dispatch, invoice, chase paperwork and answer the phone at nine at night, that is a job someone would otherwise be paid to do. When your own labor is invisible in the model, every load looks more profitable than it is, and the business quietly runs on unpaid work.
Put a number on it — what you would have to pay someone to do what you do — and add it to fixed costs. The figure that comes out the other side is the one worth negotiating with.
4. The miles you do not get paid for
Cost per mile is calculated on total miles. Rates are paid on loaded miles. Those are not the same number, and the gap between them is where margin goes.
When part of your running is empty, your cost per LOADED mile is higher than your cost per total mile, because the same costs are spread across fewer paying miles. Run the calculation both ways. The loaded-mile figure is the one to compare a rate confirmation against.
What the number is for
A cost per mile is not a report. It is a decision tool, and it answers three questions quickly:
- Is this rate profitable, or just busy? Anything under your loaded-mile cost is a load you are paying to haul.
- Which lanes are actually working? The same rate produces different margins depending on deadhead, tolls and turn time.
- What happens when I add a truck? Fixed costs step up before revenue does, and knowing by how much is the difference between growth and a cash-flow hole.
Recalculate it quarterly. Insurance, fuel and maintenance all drift, and a cost model built on last year's numbers will confidently tell you a losing rate is fine.
Sources and further reading
Regulations cited (eCFR, current text)
- 49 CFR 387.9 — Financial responsibility, minimum levelsThe $750,000 liability floor for general freight.
- 49 CFR 395.3 — Maximum driving time for property-carrying vehiclesThe 60- and 70-hour limits that cap a truck's weekly miles.
- 49 CFR 396.3 — Inspection, repair, and maintenanceWhy maintenance belongs in the model, not in the surprises.
On NeuroHaul
- Cost per mile calculatorThe same build on your own numbers, with the weekly rate floor.
- Deadhead calculatorWhat the empty miles in part 4 cost over a year.
- Maintenance is a cash decision, not a mechanical oneTurning twelve months of repairs into a per-mile reserve.
- Start the insurance renewal conversation in month nineThe biggest fixed cost, and how to keep it from jumping.