Dated input and source
| Input | Value | Official source |
|---|---|---|
| USD per gallon (on-highway diesel, all taxes included) | $6.10 per gallon | Gasoline and Diesel Fuel Update, 2026-09-14 |
| Calculator result shown below | $1.64 true cost per mile with illustrative nonfuel inputs | Serman Tools calculation using the stated official and illustrative inputs |
Source note: EIA weekly retail on-highway diesel price, including all taxes. Only fuelPrice is sourced from EIA; every other preloaded operating input is explicitly illustrative and editable.
Accessed: 2026-09-20. Refresh: Weekly EIA snapshot; keep the page date and calculator input synchronized.
Worked example
Start with the dated official input of $6.10 per gallon. With the editable illustrative assumptions preloaded below, the calculator returns $1.64 true cost per mile with illustrative nonfuel inputs. Replace every nonofficial assumption with verified business records before using the result in a quote or operating plan.
What is official and what is illustrative?
The $6.10 diesel price is the official dated EIA regional value. Monthly miles, MPG, maintenance, tires, tolls and fixed costs are illustrative defaults and must be replaced with the operator’s records.
Related guide and workbook
Read the related Serman Tools guide for the calculation method and its limits. Owner Operator Profit Workbook keeps the related model in a downloadable workbook.
Questions about this data page
Is the displayed figure a quote or market rate?
No. It is a dated official input used in a transparent planning calculation, not a selling-price recommendation.
Why can the result differ from my actual cost?
Your payroll, benefits, fuel economy, utilization, fixed costs and purchasing conditions can differ materially from the published benchmark.
When should this page be refreshed?
Weekly EIA snapshot; keep the page date and calculator input synchronized.
Can I change every calculator input?
Yes. The dated official value is preloaded, but every field remains editable in the browser.
Which official input is preloaded?
$6.10 per gallon, the EIA on-highway diesel price for Lower Atlantic dated 2026-09-14.
How is the planning result calculated?
The calculator combines the $6.10 EIA diesel input with editable mileage, MPG, maintenance, tire, toll and fixed-cost assumptions, producing a $1.64 illustrative all-mile cost.