Nobody hands you a fleet budget manual on your first day. You get a spreadsheet, a stack of invoices, and a login to some software you have never seen before. Then someone asks how much your fleet costs per mile, and you realize you are not entirely sure.

That moment is exactly why understanding fleet cost categories matters before anything else. You cannot manage what you have not measured, and you cannot measure what you have not defined. Getting your budget structure right in year one sets the foundation for every decision you will make after that.

Fixed Costs: What You Pay No Matter What

Fixed costs stay roughly constant whether your trucks run 100,000 miles or sit in the yard for a week. They are predictable but that makes them easier to plan for. They also keep charging even when your fleet isn’t generating revenue.

Vehicle acquisition or lease payments are the biggest fixed cost for most fleets. According to ATRI’s 2025 Operational Costs of Trucking report, truck and trailer payments rose to 39 cents pm in 2024. That’s up 70 percent since 2015. Whether you own or lease, this line item demands close attention throughout the vehicle’s life cycle.

Insurance premiums are the second major fixed cost. Commercial fleet insurance covers liability, physical damage, and cargo. Its cost is directly tied to your fleet’s claims history, driver records, and CSA scores. AtoB’s fleet cost breakdown notes that insurance runs approximately 8 cents per mile for commercial trucking operations — and that figure has risen steadily for years as claims costs increase industrywide.

Depreciation is the fixed cost most new managers forget to track. Every truck loses value the moment it leaves the lot. According to Fleetio’s fleet benchmarking report, vehicle operating costs start at roughly 23 cents per mile in the first five years and climb to 31 cents per mile after ten years — largely driven by rising maintenance and faster depreciation. Tracking depreciation matters because it affects when replacement becomes more economical than continued operation.

Licensing, registration, and permits round out the fixed cost picture. These vary by state and vehicle class, but they are non-negotiable and need a line in your budget every year.

Variable Costs: What Moves With Your Miles

Variable costs scale with how much your fleet runs. They are harder to predict precisely, but they are also where most of your cost-reduction opportunities live.

Fuel is the largest variable expense for nearly every fleet. According to ATRI’s data, fuel averaged 48 cents per mile in 2024 — down from a 2022 peak of 64 cents, but still representing the biggest single variable cost you will manage. Driver behavior, routing, idle time, and vehicle spec all affect this number directly.

Maintenance and repairs split into two sub-categories worth tracking separately. Scheduled preventive maintenance — oil changes, filter replacements, brake inspections — costs far less per event than reactive repairs. Fleetio’s benchmark data puts the average oil change at $78, while a radiator replacement averages $798. Fleets with strong preventive maintenance compliance spend 25 to 35 percent less on repairs overall than fleets running on a reactive-only approach.

Tires are their own line item. They are the third-largest variable expense for most commercial fleets and are heavily influenced by load weights, route surfaces, tire pressure management, and driver behavior. Track tire cost per mile and per vehicle separately — one truck running consistently underinflated will cost you far more than the fleet average.

Tolls and parking vary widely depending on your routes and operating region, but they add up faster than most new managers expect. Build these into your per-mile cost from the start rather than treating them as miscellaneous expenses.

Semi-Variable Costs: The Middle Ground

Some costs do not fit cleanly into fixed or variable buckets. Driver wages are the clearest example. Base pay is relatively fixed, but overtime, per-diem payments, and bonuses fluctuate with utilization and operational demands. According to ATRI, driver wages averaged nearly 80 cents per mile in 2024 — making driver compensation the single largest cost category in most trucking operations.

Telematics and fleet management software subscriptions also fall here. Expert Market’s 2026 fleet cost guide notes that telematics costs range from roughly $14 per vehicle per month at the entry level to $45 or more for mid-range platforms, with heavy-duty vehicle systems running higher. These are predictable costs, but they scale as your fleet grows.

Driver training, compliance programs, and drug and alcohol testing are semi-variable costs that are easy to underbudget. They are non-negotiable expenses in a regulated industry, and skipping them creates far larger costs downstream in the form of violations, accidents, and liability exposure.

The Metrics That Actually Matter

Once you have your cost categories defined, two metrics do most of the analytical work: cost per mile and total cost of ownership per vehicle.

Cost per mile is calculated by dividing all fleet costs — fixed, variable, and semi-variable — by total miles driven in a given period. According to Geotab’s fleet cost analysis, the industry average total cost per mile for commercial fleets reached $2.26 in 2024. That figure is your starting benchmark for a Class 8 long-haul operation. Regional and mixed-use fleets will land differently depending on their vehicle class and route type.

Total cost of ownership (TCO) per vehicle gives you a longer view. It captures everything a vehicle costs you from acquisition through disposal, including depreciation, maintenance trends over time, and eventual resale or salvage value. According to OxMaint’s fleet benchmarking data, the gap between top-quartile fleet performance and industry average performance is typically 35 to 50 percent on total cost per vehicle — meaning disciplined measurement and benchmarking has real dollar value.

Starting Your Benchmarking Habit

Tracking costs is only useful if you compare them against something. Your first benchmark is your own fleet’s baseline — what does each vehicle actually cost to operate right now? Your second benchmark is industry data, like ATRI’s annual cost report or Fleetio’s fleet benchmarking report, which give you a peer comparison.

From there, set a quarterly review cadence. Pull your cost-per-mile by vehicle, identify outliers, and investigate the cause before it becomes a pattern. One truck running 15 percent above the fleet average on maintenance cost is a question worth asking before it becomes a major repair bill or a safety incident.

 

Also read: Stop Guessing: The True Cost of 10-Year-Old Trucks