Six cost buckets — and the one nobody tracks until it's too late
Fleet managers who build budgets from pickup-ticket fuel invoices alone typically miss 35-45% of their real cost. The full picture has six buckets:
1. Depreciation — the largest line item on most fleets. A $45,000 Ford F-150 XL loses $6,750 in year 1 at 25,000 fleet miles. Across a 10-truck fleet, that's $67,500 of real capital cost that never shows up on a fuel card statement. Always the biggest surprise in a ground-up TCO.
2. Fuel — the line every manager tracks. A 10-truck fleet at 25,000 miles/year, 16 MPG, $3.50/gal = $54,700/year. Commercial fuel cards (WEX, Fuelman, Shell Fleet) save 3-8 cents/gallon ($1,600-$4,400/year on this fleet) but also generate the transaction-level data you need for IFTA compliance if you cross state lines.
3. Insurance — $1,800-$3,200/vehicle for light duty, higher for heavy. Commercial auto is fundamentally different from personal — policies bundle hired/non-owned coverage, physical damage per-vehicle, and fleet-rated experience pricing. Most fleets over-insure in year 1 and under-insure in year 3 as the fleet ages.
4. Maintenance — runs $0.07-$0.14/mile depending on vehicle class. A 10-truck fleet at 25,000 miles at $0.10/mile is $25,000/year. Preventive maintenance contracts (quick oil + fluid at intervals) cost more upfront but reduce downtime dramatically, which matters more than the direct cost on a revenue-generating fleet.
5. Telematics — $25-$45/vehicle/month in 2026. $3,000-$5,400/year on a 10-truck fleet. Pays for itself almost always once driver behavior data lands at the insurance renewal.
6. Admin and compliance — the forgotten bucket. Titling, registration, DOT compliance, IFTA filings, driver qualification files, drug/alcohol programs for CDL operators. $400-$1,200 per vehicle per year. A 10-truck fleet under DOT/FMCSA regulation can easily spend $15,000-$25,000/year here, much of it on the fleet manager's time.
Fleet size breakpoints — when the math changes
1-5 vehicles: founder-operated
Often run by the business owner or office manager. Commercial auto policy, personal fuel cards, ad-hoc maintenance at whoever-is-closest. Total cost per vehicle typically 10-15% higher than best-practice fleets because there's no negotiating leverage. Fine for small service businesses; a growth ceiling for anyone scaling.
6-15 vehicles: formalize or bleed
The zone where ad-hoc stops working. Preventive maintenance schedule, dedicated commercial insurance broker, fuel card program, basic fleet software (Fleetio, $4-$10/vehicle/month) all become essentials. Dedicated fleet admin (full or part-time) usually pays for itself in this range via insurance negotiation, better maintenance discipline, and lower vehicle turnover.
16-40 vehicles: FMC consideration
Full-service fleet management companies (Element, Wheels, Enterprise Fleet, Merchants) start making sense. They bundle maintenance networks (national chains with pre-negotiated rates), accident management, registration services, fuel cards, and driver safety programs. Typical FMC management fee: $40-$75/vehicle/month. Break-even against in-house management depends heavily on local wage rates and existing relationships.
40+ vehicles: full-fleet optimization
Dedicated fleet manager role at $80-$120K fully loaded. Custom telematics dashboards, fleet-wide routing optimization (Routific, Onfleet for last-mile; Trimble or Samsara Routing for over-the-road), driver scorecards, predictive maintenance based on fault codes. Electrification pilots (F-150 Lightning, Transit Electric, RAM ProMaster EV) start penciling out on specific depot-return routes.
Seven moves to cut fleet cost 15-30%
1. Rotate vehicles at 80-100K miles, not at failure. The "drive 'em until they die" approach costs more than planned replacement cycles. Sweet spot: dispose at 80-100K before the $3,000-$6,000 repair events cluster at 120-150K.
2. Standardize the fleet to 1-2 models. One make/model of van, one truck. Better parts pricing, faster mechanic familiarity, interchangeable drivers. Fleets that run 5-6 different models typically spend 12-18% more on maintenance.
3. Deploy driver behavior telematics. Harsh braking, speeding, idling — the 3 behaviors that drive fuel cost, tire cost, and accident rate. Coached drivers show 15-30% improvement in 90 days.
4. Use a commercial fuel card (WEX, Shell, Fuelman, Comdata). 3-8 cents/gallon discount plus transaction-level data. On a 10-truck fleet, $1,500-$4,000/year of direct savings plus audit-ready records.
5. Bundle insurance with a commercial broker, not a direct carrier. Marsh, Lockton, Hub, and HilltopSecurities Fleet all compete fleet business hard. Getting 3 bids every 2 years typically surfaces 8-15% savings that stays invisible on auto-renewals.
6. Preventive maintenance contract with a national chain. Jiffy Lube Fleet, Valvoline Commercial, Pep Boys Fleet Services offer pre-negotiated rates + national access. Cheaper than dealer but more consistent than random local shops.
7. Pilot one EV on a tight route. Fleet EVs (F-150 Lightning, Ford Transit Electric, RAM ProMaster EV) have 30-50% lower operating cost per mile than their gas siblings if charging at a depot. Even a single-vehicle pilot generates data that makes the business case for larger rollouts — and tax credits (commercial clean vehicle credit) significantly offset acquisition cost.
Related tools
- True cost of ownership — single-vehicle TCO that underlies fleet math.
- Mileage reimbursement — for employees using personal vehicles.
- EV vs gas savings — electrification math for fleet pilots.
- Car insurance estimate — underlies commercial insurance benchmarks.