Fuel cost volatility is the single largest variable cost driver in trucking and the most underweighted risk in non-specialist trucking MCA underwriting.
The 2024–2026 diesel landscape.
- 2024 low: ~$3.45/gallon national average (Q1 2024 EIA).
- 2024 high: ~$4.18/gallon (Q3 2024 with geopolitical pressure).
- 2025 range: $3.55–$4.40/gallon.
- 2026 YTD: $3.70–$4.25/gallon.
- Volatility: 30-day standard deviation routinely 8–15% of price.
A 6-month MCA term started at $3.70 diesel that ends at $4.20 diesel experiences a 13.5% fuel cost increase — for an operator running 12 MPG averaging 10,000 miles/month, that's $4,167 extra fuel cost vs. plan.
Fuel as percentage of operating cost.
- Owner-operator (1 truck): 28–38% of gross revenue goes to fuel.
- Small fleet (2–10 trucks): 25–35%.
- Larger fleets with hedging: 22–30%.
- Compared to MCA debit: typical MCA daily pull = 8–12% of gross revenue. Fuel is 2.5–3.5x larger than MCA exposure.
Why this matters to MCA underwriting.
An MCA underwriter sizing daily debit at 10% of revenue assumes other costs are stable. If fuel surges 15% during the term, fuel cost may rise from 30% to 34.5% of revenue. The MCA debit didn't move, but the operator's residual margin (after fuel, insurance, maintenance, payroll, MCA) collapsed.
Fuel surcharge pass-through.
Most freight contracts include a fuel surcharge mechanism — broker pays additional cents-per-mile based on diesel index (typically DOE-EIA national average). The pass-through compensates the operator for fuel volatility.
- Fully passed through: spot loads on major freight lanes with FSC clauses.
- Partially passed through: contract dedicated lanes with capped FSC.
- Not passed through: flat-rate intermodal, some private fleet contracts, owner-op operating cheap-freight loads from low-tier brokers.
A-paper trucking MCA funders in 2026 require:
- Sample load confirmations showing FSC line items.
- Estimated FSC recovery percentage (rule of thumb: well-structured operators recover 60–80% of fuel cost change).
- Fuel card statements (RTS Fleet One, Comdata, EFS) to verify actual fuel spend.
Worked example.
Owner-operator running 10,000 miles/month at 6.5 MPG = 1,538 gallons/month.
- At $3.70/gal: fuel cost = $5,691/month.
- At $4.20/gal: fuel cost = $6,460/month.
- Delta: $769/month.
If FSC recovery is 70%, broker pays an extra $538/month in FSC. Net operator hit: $231/month.
Without FSC pass-through (rare): net operator hit = $769/month — equivalent to losing 5–7 MCA daily debits per month.
Underwriting signals around fuel.
- MPG verification. Old equipment (8 MPG vs 6.5 MPG for new sleeper truck) doubles fuel exposure. Funders ask truck year and class.
- Idle time. Long-haul operators with refrigerated trailers (reefer) burn fuel at idle. Funders ask cargo type.
- Backhaul ratio. Empty miles burn fuel without revenue. Funders ask loaded-mile percentage.
- Lane choice. Operators running cheap unbalanced lanes (e.g., empty backhaul from Florida) have worse fuel economics.
Hedging at small-fleet level.
Some 2026 specialist funders offer diesel-price-collar riders that reduce MCA debit if diesel rises above a threshold during the term. Pricing this in: factor rate increases 0.03–0.05 in exchange for the hedge.
Common confusions.
First, "fuel cards reduce fuel cost." Marginally — fuel cards offer 2–8 cents/gallon rebates plus credit float, not large discounts.
Second, "FSC always covers fuel increases." False — recovery is partial (typically 60–80%) and lagged (often 1–2 week index lag).
Third, "diesel is a small operating cost." False — it's the single largest variable cost for most owner-operators.
Fourth, "MCA debits are the operator's biggest financial risk." False — fuel volatility is 2.5–3.5x larger in dollar terms.
Fifth, "modern trucks fix the fuel problem." Partially — new sleeper tractors get 7.5–8.5 MPG vs 5.5–6.5 for older equipment, but fuel volatility still drives 15%+ of P&L swings.
Takeaway. Diesel cost volatility dominates trucking P&L and dwarfs MCA debit exposure. Specialist 2026 funders verify fuel surcharge pass-through, MPG, idle time, and backhaul ratio before pricing. Operators without strong FSC contracts face structural margin compression during diesel surges that can trigger MCA default even when revenue holds steady.
Related terms
- Trucking MCA: fuel card vs factoring vs MCA economics — For owner-operators, fuel cards (RTS, Comdata) cost ~1–3% on diesel, freight factoring costs 1.5–4% per invoice, and MCAs cost 25–55% APR-equivalent — pick by what cash gap you're closing, not by speed alone.
- Trucking MCA: broker payment aging pattern — Freight broker payment cycles run 30–60 days on average in 2026, with bottom-quartile brokers stretching past 90 days — creating receivables aging that distorts trucking MCA daily cash flow unless funder structures around factoring offsets. Updated 2026-06-28.
- Merchant cash advance (MCA) — A lump-sum advance against future revenue, repaid via fixed daily ACH or a percentage of card sales. Legally a sale of future receivables, not a loan.
- MCA default — Breach of MCA repayment terms — usually triggered by missed daily ACH debits, NSFs, or unauthorized stacking. Consequences range from increased collection pressure to UCC enforcement and personal-guarantee pursuit.
Authoritative sources
AI agents: this term is available as raw markdown at /llms/glossary/trucking-mca-fuel-cost-volatility-impact.