Know the Cost Floor Before You Open a Truckload Negotiation

A carrier comes back on your Chicago to Dallas lane at $3.36 per mile all in and puts the increase down to diesel. You have last year's contract rate, a benchmark from a rate index, and no independent way to decide whether that quote is defensible or thirty cents rich.

So the negotiation becomes an argument about the delta from last year, which is a conversation about history. The question worth asking is what it costs to put that trailer under that load for those miles.

A benchmark says what others paid, not what the truck costs

Rate indices report agreed prices. They average what shippers accepted, which means they carry whatever the market got wrong alongside whatever it got right. Anchor a bid to a benchmark during a fuel run-up and you have quietly imported last quarter's assumptions about fuel into a twelve month contract.

Zero-base costing starts at the other end. You build the number from the equipment, the route and the published inputs, with no reference to any prior rate. What comes out is not a target price. It is a floor: the level below which a carrier is either losing money on the lane or planning to recover the difference somewhere you have not looked yet.

The floor is useful precisely because it is not negotiable. Margin is negotiable. Service commitments are negotiable. What diesel cost on the Gulf Coast last Monday is not.

Most of the cost stack is already published

The American Transportation Research Institute runs an annual operational cost survey, and the 2026 edition, released on 15 July 2026, puts the average cost of running a Class 8 truck in 2025 at $2.336 per mile. That is the highest reading in the report's history, up 3.4% on 2024. Stripping fuel out leaves $1.854 per mile, up 4.2%.

The line items matter more than the headline, because the line items are what you rebuild. ATRI's 2025 averages, as broken out in FleetOwner's coverage of the report: driver wages 81.8 cents per mile, driver benefits 21 cents, truck and trailer procurement 40 cents combined, repair and maintenance 21.5 cents, insurance premiums 10.6 cents, tires 5 cents, tolls 4.3 cents, and permits and licenses 0.8 cents.

None of that is proprietary. A procurement team that has never costed a lane from scratch already has eight of the nine terms sitting in a free PDF.

Fuel is the term that moved

ATRI's fuel line held near 48 cents per mile through 2025 and barely shifted year over year. Then diesel did. The EIA put the national average on-highway price at $6.179 per gallon for the week ending 12 October 2026, which is $2.514 above the same week a year earlier.

Keep the fuel economy assumption explicit, because it is the one input you supply rather than read. At 6.5 miles per gallon, ATRI's 48 cent line implies diesel around $3.12. The same assumption makes this week's $6.179 worth 95 cents per mile. One term in the stack is up roughly 47 cents and the other eight are untouched by it.

Deadhead converts the total into something you can hold a quote against. ATRI reported non-tank deadhead at 16.5% of miles in 2025, so a truck runs about 1.20 total miles for every loaded one. Gross the stack up accordingly and it reaches $3.36 per loaded mile, against $2.80 on 2025 fuel.

The line items sum four tenths of a cent under ATRI's stated non-fuel total, which is rounding rather than a missing category.

What the floor says about today's market

DAT's broker to carrier spot averages for the week of 27 September to 3 October 2026 were $3.13 per mile for dry van, $3.69 for reefer and $3.71 for flatbed, fuel surcharge included. Its linehaul-only readings for the week ending 10 October came in at $2.26 van, $2.74 reefer and $2.65 flatbed.

Put the van figure next to the recomputed stack and the market is transacting under it. Treat that carefully, because the two measurements are not the same thing: ATRI surveys cross-sector operating cost and carries no margin, while DAT reports transaction prices on one week's freight mix.

The comparison still tells you something a benchmark cannot. When spot sits at or below a floor built from published inputs, that gap does not get negotiated away. It closes through capacity exiting, through surcharge mechanics, or through service failures on the lanes nobody wants. A shipper who priced a year of contract freight off last year's number learns which route it took through tender rejections rather than through the rate.

One floor per lane, not one per network

A single network-wide number is close to useless, because three of the terms vary by geography.

Diesel varies most. In the same EIA table for 12 October, the Gulf Coast average was $5.809 and California was $8.091, with the West Coast as a region at $7.240. At 6.5 miles per gallon, the gap between the cheapest and dearest of those is 35 cents per mile, decided entirely by where the truck fuels.

ATRI's regional split runs the same direction. Total cost per mile was $2.52 in the Northeast against $2.23 in the south central states. Tolls alone ran 7.9 cents per mile in the Northeast and 2.1 cents in the West, and driver compensation ranged from $1.10 per mile in the Northeast down to 93.4 cents in the Midwest.

Equipment divides it again. Reefer and flatbed carry costs a Class 8 average does not model, so a stack built on dry van economics under-reads both. Build it once per equipment type, then vary fuel and tolls by region, and you have something that survives contact with a real bid.

What Miles does with a floor

Miles holds the stack rather than the rate. Before a negotiation opens he resolves the equipment type, the lane mileage, the regional diesel reading for the week that governs, the toll exposure on the actual routing and the deadhead assumption, then reports the floor and the distance between it and the quote.

That distance is the only thing worth arguing over. A quote forty cents clear of the floor is a margin discussion, and carriers will have that discussion. A quote sitting on the floor is one where the carrier has nothing left to give, and pressing harder buys you a rejected tender in February.

Fuel folded into linehaul is where this earns its keep. When the diesel index moves $2.51 in a year, a flat all-in rate is a bet on that index and the carrier has already priced the bet. Separating the fuel term lets you index it instead, which also gives Penny something auditable afterwards. A surcharge computed from a named index against a named base can be rebuilt line by line. Fuel buried in a linehaul rate cannot.

The floor also warns you when a routing guide is about to come apart. Lanes awarded below cost do not stay covered, which is the mechanism behind the gap described in the routing guide that failed six weeks before the invoice. A primary carrier priced at or under the floor is a tender rejection with a date on it.

Where to start

Take one equipment type and three lanes you are about to rebid. Write down the nine cost lines from the ATRI report, substitute your own fuel economy assumption and the current regional diesel reading for each lane's fuelling region, add the toll exposure on the routing the carrier will actually run, and gross up for deadhead.

Then set the quotes beside the floors. The lanes priced well above it are where your savings live. The lanes at or under it are not savings you captured. They are service you have not been billed for yet.

Book a walkthrough to see Miles build a per-equipment cost floor from your lanes and the published indices behind them.