Fractional CFO for Trucking Companies: Cost per Mile, Fuel, and Equipment Cash

The American Transportation Research Institute reports that the average cost to operate a truck in 2025 was $2.336 per mile, the highest in the report's history, with non-fuel costs at $1.854. In the same release, truckload and refrigerated operating margins were still below 1%.

That's the industry. It isn't your fleet. A fractional CFO for trucking companies replaces the industry average with your own cost per mile, split into fixed and variable layers, and then prices every load, lane, and customer against it. When margins are that thin, a 10-cent error in your cost per mile is the difference between profit and a slow loss.

Build your own cost per mile in two layers

Most carriers know their fuel cost and their driver pay. Fewer know what a truck costs when it's parked.

Fixed cost per truck per month = truck and trailer payment + insurance + permits and HVUT share
                                 + ELD/telematics + parking + allocated overhead
Variable cost per mile = fuel + driver pay per mile + maintenance and tires + tolls
Total cost per mile = (fixed cost per truck per month ÷ total miles per truck per month) + variable cost per mile

The fixed layer is why utilization matters so much. Spread $6,000 of fixed cost over 10,000 miles a month and it's 60 cents a mile. Spread it over 7,500 miles and it's 80 cents. Same truck, same driver, same freight rate, and 20 cents a mile of margin disappears because the truck sat for a week.

Use total miles, not loaded miles, in that denominator. Empty miles cost almost as much as loaded ones.

The miles that don't pay

Revenue per loaded mile is how loads get quoted. Revenue per total mile is what the business actually earns.

A hypothetical 25-truck dry van fleet, monthly:

Quoted at $2.70 a loaded mile, the freight looks healthy. Measured on total miles, the fleet keeps about 5 cents: $555,000 of revenue, less $155,000 of fixed cost and $387,100 of variable cost, leaves $12,900 for the month. Cut deadhead from 16% to 12% on the same loaded miles and total miles fall to about 233,900. Variable cost drops by roughly $17,600 a month and fixed cost per mile rises slightly, to about 66 cents. Margin per total mile moves to about 13 cents, roughly two and a half times where it started.

The lever that matters here isn't the freight rate. It's backhaul planning, lane density, and which customers create empty repositioning. A CFO ranks customers by contribution per truck-day, including the empty miles their freight forces, rather than by revenue.

Fuel: price it in, then watch the lag

ATRI's release implies fuel was roughly 48 cents of 2025's $2.336 per-mile cost ($2.336 total minus $1.854 non-fuel). Fuel surcharge programs recover it, but they typically reset weekly or monthly against a published diesel index, while you pay at the pump every day.

When diesel rises quickly, the surcharge lags the cost. Suppose a hypothetical fleet runs 6.5 miles per gallon and fuel rises 40 cents a gallon in two weeks. That's about 6 cents a mile of unrecovered cost until the index catches up. On 245,000 miles a month, half a month of miles at that gap (122,500 × about 6.15 cents) costs roughly $7,500, which is more than half of the fleet's entire monthly margin in the table above.

Three checks for any fuel program:

1. Does the surcharge base price match what's already built into the linehaul rate? If not, you're either double-charging or under-recovering.
2. Does every contract and spot quote carry the surcharge, or only the large customers?
3. What MPG does the surcharge formula assume, and is it close to your fleet's actual average?

The same logic applies outside trucking. The fuel surcharge guide for service contracts walks through matching the surcharge to the fuel already built into the price.

Margin per total mile is the number most carrier P&Ls never show. A Leak Check on cost per mile and deadhead starts from your truck count, monthly miles, and fuel spend, and shows whether utilization, empty miles, or surcharge lag is eating the margin.

Equipment cash: depreciation is not a payment

Trucks are where tax planning and cash planning most often get confused.

Under the One Big Beautiful Bill, qualified property acquired after January 19, 2025 is eligible for a permanent 100% additional first-year depreciation deduction, with Treasury and IRS guidance in Notice 2026-11. That can turn a hypothetical $180,000 tractor into a $180,000 current-year deduction.

It doesn't change the loan. If the tractor is financed over 60 months, the cash goes out monthly for five years while the deduction lands in year one. Years two through five then carry payments with little depreciation left to offset them. Fleets that buy heavily in a strong year to cut taxes can create a tax bill in a weaker year with no matching cash.

A CFO plans equipment in three views at once:

• Cash: down payment, monthly payment, and maintenance curve by truck age.
• Tax: when the deduction lands and what it does to the following years.
• Debt capacity: what lenders will advance, and what you're personally guaranteeing. The personal guarantee guide covers what that signature puts at risk.

Don't miss the fixed compliance calendar either. The heavy highway vehicle use tax on Form 2290 runs on a tax period from July 1, 2026, through June 30, 2027 for vehicles of 55,000 pounds or more, and is due by the last day of the month following the month of first use. It's a predictable annual cash outflow that belongs in the forecast, not a surprise in August.

The cash gap between delivery and payment

A carrier pays for a load long before it gets paid for it. Fuel goes on the card the day the truck rolls. Drivers are settled weekly. The shipper or broker pays on 30-day terms if you're lucky, 45 if you're not.

In the hypothetical 25-truck fleet, $555,000 of monthly revenue on 35-day average collection means roughly $640,000 is sitting in receivables at any time ($555,000 × 12 ÷ 365 × 35). That's working capital the business has to fund before it earns a cent of margin.

Growth makes it worse, not better. Add five trucks and revenue rises about $111,000 a month, but receivables rise by around $128,000 before the new trucks' first invoices are paid. At about 5 cents a total mile, five trucks running 49,000 miles a month earn roughly $2,600 of margin a month. Funding their own receivables out of that margin would take around four years. That's why fast-growing fleets can be profitable and still run out of cash.

The CFO's tools here are plain:

• Collection terms by customer, tracked as days sales outstanding, with a decision on who gets quick-pay and at what fee.
• Factoring cost expressed per mile, so it can be compared directly with margin per total mile.
• A credit limit per broker or shipper, because one slow payer with a large share of freight can stall payroll.
• A growth gate: new trucks are added only when the forecast shows the receivables increase can be funded without maxing the credit line.

A first quarter with a trucking CFO, month by month

1. Month one: a cost per mile you trust.
   • Re-map the chart of accounts into fixed and variable cost by truck.
   • Reconcile fuel card data, ELD miles, and settlement records to the ledger.
   • Produce the first total cost per mile, by truck and fleet-wide.
2. Month two: price the network.
   • Build revenue and contribution per total mile by customer and lane, deadhead included.
   • Audit fuel surcharge terms against actual MPG and base price.
   • Start the tax plan, including how planned equipment purchases interact with bonus depreciation.
3. Month three: fund the fleet.
   • Build a 13-week cash forecast with settlement timing, factoring or quick-pay fees, and Form 2290.
   • Model the next equipment purchase in cash, tax, and debt views.
   • Set the monthly KPI review: revenue per total mile, cost per mile, deadhead, and days sales outstanding.

That's how Bennett's fractional CFO services start for a transportation business. The engagement is $5,000 a month and includes bookkeeping, tax returns, and tax planning. Veterans Fleet Management describes in its own words why it wanted strategic guidance rather than bookkeeping alone. Your cash reserve target should reflect how thin these margins run.

Your next calculation is margin per total mile for each of your top five customers. If any of them is below 5 cents once you count the empty miles their freight creates, that's the first conversation to have, and a Leak Check built around your lanes and fleet costs is a quick way to have it with real numbers.