USDOT 4353234 · Regional & Local Freight Specialists
Dry van tractor-trailers on a US highway: diesel share of carrier operating costs per mile 2026
Rates & Market Update

Diesel Share of Carrier Operating Costs Hits 43%: What to Put in Your Fuel Clause

El diésel ya es el 43% del costo operativo de un carrier: qué poner en tu cláusula de combustible

Por Sultan Freight Editorial6 min de lectura

Diesel is no longer a line item. In DAT's week 43 report (October 17-23, 2026), diesel's share of carrier operating costs for a dry van reached about 92 cents a mile, or 43% of the cost of running the truck, up from 59 cents and 32% before the price spike. For NJ/NY shippers pricing Q4 freight and owner-operators deciding what to accept, that one ratio explains why a fuel clause now matters as much as the linehaul number.

Diesel share of carrier operating costs: the week 43 numbers

All figures are DAT One national data for October 17-23, 2026. Spot rates are 7-day broker-to-carrier averages that include the fuel surcharge. The fuel column is our calculation (all-in minus linehaul).

EquipmentSpot all-inLinehaulFuel in the rate
Dry van$3.07 (-2¢)$2.24 (-2¢)about 83¢
Reefer$3.63 (-3¢)$2.73 (-2¢)about 90¢
Flatbed$3.61 (-3¢)$2.63 (-2¢)about 98¢

The spot averages slipped, but the fuel surcharge was nearly unchanged week over week, so almost all of the decline came from linehaul. Load posts across all equipment were 2.58 million, down 2%.

Diesel for a dry van carrier: about 92¢ a mile, 43% of operating costs, versus 59¢ and 32% before the spike. (DAT, week 43 report)

Why the diesel cost per mile jumped

EIA's national diesel average was $6.179 a gallon for the week of October 12 and $6.276 for October 19, up 9.7 cents. DAT estimates that move adds about 2 cents a mile to next week's fuel surcharge. At the pump, Pilot Flying J averaged $6.47 a gallon on October 24, up 13 cents (2%) from October 17 and $2.17 (51%) above the pre-spike baseline of $4.30 that DAT uses.

Backing into totals from DAT's percentages (our calculation, rounded), total operating cost is near $2.14 a mile today versus $1.84 before. Diesel's extra 33 cents accounts for essentially the whole increase.

What it means on a real NJ/NY lane

Illustrative math with DAT national averages: on a 300-mile van lane, diesel at 92 cents a mile is about $276 a load. At 59 cents it was about $177, so fuel alone adds roughly $99 per load. Meanwhile the fuel built into the average van spot rate is only about 83 cents a mile. The two numbers are not measured the same way, but the direction is clear: a lagging or fixed surcharge leaves the carrier covering the gap.

Northeast buyers have one more variable. EIA's October 19 East Coast average was $5.984, 29 cents below the national figure, so the index you pick changes the result. We break down that formula in fuel surcharge record per mile.

Five fuel clause moves for shippers and owner-operators

  • Shippers: quote linehaul and fuel separately. Fuel is 43% of the carrier's cost and moves every week. A single flat number hides which part changed.
  • Shippers: name the index in writing. EIA weekly national or East Coast, with a base price and a miles-per-gallon assumption, removes the argument later.
  • Shippers: agree the update day. EIA publishes Mondays. A clause that updates weekly follows the pump instead of trailing it by a month.
  • Owner-operators: price off linehaul plus your real fuel cost. If the offer is below $2.24 plus your diesel on the lane, you are subsidizing the load. See linehaul vs all-in rate.
  • Owner-operators: check the rate confirmation for a fuel line. If it says "all-in" with no fuel schedule, ask how it changes when diesel moves 10 cents.

A simple fuel clause check before you sign

Most disputes come from a clause that nobody wrote down. Before you accept a rate confirmation, answer four questions: which index sets the price (EIA national, EIA East Coast or a fuel card average), what base price and miles per gallon the formula assumes, how often it updates, and whether it moves down as well as up. If any of the four is blank, the all-in number is really a guess about where diesel will be on delivery day.

Run the math once per lane. At 6 miles per gallon, every 10 cents of diesel is about 1.7 cents a mile, so a clause that ignores a 30-cent move leaves roughly 5 cents a mile unpaid, or about $15 on a 300-mile load. That is small on one load and large across a month of Northeast runs. The point is not to win every negotiation but to know which side of the gap you are on before you book.

How this connects to the rest of the van market

Capacity is why carriers can ask for this at all: the load-to-truck ratio is still historically elevated, as we covered in dry van load-to-truck ratio. A softer ratio does not erase a 43% fuel share. For how diesel hit Northeast lanes earlier in the year, read diesel NJ/NY and the fuel surcharge.

Frequently asked questions

What share of a carrier's operating cost is diesel in 2026?

For a dry van carrier, DAT puts diesel at about 92 cents a mile, or 43% of operating costs, in its week 43 report (October 17-23, 2026). Before the diesel spike it was 59 cents, or 32%. Pilot Flying J averaged $6.47 a gallon on October 24.

How should a fuel clause handle diesel at $6.28 a gallon?

Tie the surcharge to a published index such as the EIA weekly national or East Coast average, state the base price and the miles-per-gallon assumption, and set a weekly update date. EIA's October 19 reading was $6.276, up 9.7 cents, which DAT estimates adds about 2 cents a mile to next week's surcharge.

Sources: DAT weekly spot report, week 43 (Oct. 17-23, 2026), via AJOT (spot rates, linehaul, EIA diesel figures, Pilot Flying J price, diesel share of operating costs); EIA East Coast figure as cited in our earlier week 42 analysis. Fuel-in-rate, total operating cost and lane examples are our calculations from those figures.

Pricing Q4 freight in the Northeast?

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Sultan Freight cotiza cargas NJ/NY con el combustible actual incluido, así que la tarifa que ve es la tarifa que paga. Pedir cotización →