Where this applies
Internal planning and retrospective cost analysis. Examples are hypothetical; this guide supplies no live rate, promised saving or accounting opinion.
Gather first
- Shipment-level invoices and credits for a defined period
- Mode, lane, service, weight, dimensions and accessorial detail
- Baseline terms, proposed terms, implementation costs and service outcomes
A repeatable method
Choose a comparable baseline
Keep shipment count, lane, service, weight and dimensions visible. Distinguish a price change from a shift toward smaller or closer shipments. Where possible, reprice the same shipment set under both terms and label any missing inputs.
Reconcile the components
Sum linehaul, fuel and accessorials, then apply relevant credits. Keep duties and product cost separate unless the analysis explicitly includes them. Check currency and tax treatment before combining invoices.
Explain the fuel method
For an indexed surcharge, document the index, effective date, base, bands and charge base from the agreement. EIA’s retail diesel series describes fuel prices, not freight rates. A lower index need not flow through immediately or proportionally.
Validate the change after implementation
Compare actual invoices and service outcomes with the modeled result. Subtract one-time transition costs and identify unresolved invoices. Report a range if missing data could change the conclusion; do not present an estimate as a realized saving.
Separate the modeled reduction from net benefit
Assumptions: The exact same 100 shipments and service requirements are repriced in USD. Baseline freight $12,000; proposed freight $11,400; one-time implementation cost $400. No volume growth, tax, currency change or unpriced service loss.
- Modeled freight reduction = $12,000 − $11,400 = $600, or 5% of baseline freight.
- First-period net modeled benefit = $600 − $400 = $200.
- If the $600 reduction repeated unchanged each month, simple payback would be $400 ÷ $600 = 0.67 month.
What this means: The repeated monthly result is a scenario, not a forecast. The $200 becomes realized only when actual, reconciled costs support it. A cheaper service that misses the required delivery standard is not an equivalent comparison.
Common mistakes
- Do not compare cost per shipment across different weight or lane mixes without explaining the change.
- Do not count the same credit, rebate or avoided charge twice.
Questions worth asking
What if some invoices have not arrived?
Label the result provisional, list the missing costs and show how they could change it. Close the analysis only after reconciliation or an explicit accrual method.
What should I bring to a freight review?
Bring the baseline period, comparable shipment sample, quote or agreement, exception evidence and your service constraints. Redact information that is not needed.
Sources, dates and limits
The linked primary sources support the specific concepts described below. The examples and decision checklists are original illustrative analysis, not figures supplied or endorsed by these organizations. A check date is not a claim that a rule, price or contract will remain unchanged.
- EIA: Methodology for Weekly On-Highway Diesel Fuel Price Estimates
Publication date not shown · Checked 2026-11-05
Explains the retail diesel survey and the methodology change implemented June 13, 2022. A fuel index is not a carrier quote or a contractual surcharge.
Use the current source, your actual shipment documents and qualified advice where needed. This guide does not book freight, settle a dispute or determine a legal obligation.