Fleet Cost Per Mile: How to Calculate, Benchmark & Reduce CPM

ATRI says the average trucking cost per mile hit $2.27 — most fleets have no idea where they stand

According to <a href="https://truckingresearch.org/2024/11/05/an-analysis-of-the-operational-costs-of-trucking-2024-update/" target="_blank" rel="noopener noreferrer">ATRI's 2024 operational costs report</a>, the average marginal cost per mile for trucking operations reached $2.27. That figure represents a slight decrease from the 2022 peak of $2.25+ driven by record diesel prices, but it's still 35% higher than the $1.65 average ATRI reported in 2019. The gap between a well-managed fleet and a poorly-managed one can be $0.30-0.50 per mile — on a 100-truck fleet running 100,000 miles per truck annually, that's $3-5 million in annual savings left on the table.

Why cost per mile is the single most important fleet metric

CPM is the fleet equivalent of a business's gross margin. It tells you whether every mile you run is profitable or bleeding money. Revenue per mile minus cost per mile equals your operating margin per mile. If you're a for-hire carrier, your rate per mile is set by the market. The only thing you can control is CPM. If you're a private fleet, CPM determines whether your delivery operation is cheaper than outsourcing to a 3PL.

Fleet managers who track CPM weekly catch problems early. A sudden spike in one truck's CPM flags a maintenance issue before it becomes a breakdown. A route with consistently higher CPM than comparable routes reveals inefficiency. A vehicle class trending upward quarter over quarter signals it's approaching replacement time. Without CPM tracking, these signals get buried in aggregate expense reports that nobody reads until budget season.

What most fleets get wrong when calculating CPM

The most common mistake is only counting the obvious costs. Fuel and driver pay are easy to capture. Maintenance invoices are trackable. But most fleets miss several categories that add $0.15-0.30 per mile: administrative overhead (dispatch labor, compliance staff, back-office processing), opportunity cost of downtime, insurance deductible reserves, licensing and permitting fees, and the real depreciation curve of each vehicle — not the accounting depreciation.

The second mistake is using averages across your entire fleet. A 2024 Sprinter van and a 2019 Peterbilt 579 have completely different cost profiles. Averaging them together gives you a number that's accurate for neither. Calculate CPM per vehicle, per vehicle class, and per route to get data you can actually act on.

What goes into fleet cost per mile? The full breakdown

Fleet cost per mile includes every expense that can be attributed to putting a vehicle on the road. According to ATRI's cost breakdown, the six primary categories are fuel, driver wages, vehicle maintenance, insurance, depreciation, and administrative costs. Each category carries different weight depending on your fleet type, vehicle class, and operating region.

Fuel costs: the largest variable in your CPM

Fuel is the single largest variable cost for most fleets. According to <a href="https://truckingresearch.org/2024/11/05/an-analysis-of-the-operational-costs-of-trucking-2024-update/" target="_blank" rel="noopener noreferrer">ATRI's 2024 data</a>, fuel accounts for approximately 24% of total carrier costs, averaging $0.547 per mile for line-haul operations. For a Class 8 truck averaging 6.5 MPG and diesel at $3.80 per gallon, fuel costs run roughly $0.58 per mile. Light-duty fleet vehicles getting 20+ MPG will see fuel costs closer to $0.15-0.20 per mile.

Driver wages and benefits

Driver compensation is typically the largest single cost category in trucking. ATRI's data puts driver wages at $0.632 per mile — roughly 28% of total CPM for line-haul carriers. Add driver benefits (health insurance, retirement contributions, workers' comp) at $0.254 per mile, and total driver-related costs reach $0.886 per mile, or about 39% of total cost per mile.

Maintenance and repair costs per mile

Maintenance and repair account for roughly 10-12% of fleet CPM. ATRI reports an average of $0.208 per mile across the trucking industry. But this number varies dramatically by vehicle age and maintenance strategy. A well-maintained truck under 400,000 miles might run $0.12-0.15/mile in maintenance costs. A truck past 600,000 miles with deferred maintenance can easily hit $0.30-0.40/mile.

According to <a href="https://www.fleetio.com/" target="_blank" rel="noopener noreferrer">Fleetio's</a> fleet benchmarking data, fleets with a preventive maintenance compliance rate above 90% spend 25-30% less on maintenance per mile than fleets running reactive programs. The reason is straightforward: a $200 preventive oil change prevents a $4,000 engine repair. Catching a tire issue at 4/32" tread depth avoids a $1,200 roadside service call.

Insurance premiums and risk costs

Insurance typically runs 5-8% of total fleet CPM. ATRI reports truck insurance premiums averaging $0.113 per mile. But this number has been climbing steadily — commercial auto insurance rates increased 15% in 2023 and another 9% in 2024, according to the <a href="https://www.ciab.com/" target="_blank" rel="noopener noreferrer">Council of Insurance Agents & Brokers</a>. Nuclear verdicts in trucking lawsuits are the primary driver, with average jury awards in trucking cases exceeding $5 million.

Depreciation and vehicle replacement

Depreciation represents the decline in vehicle value over time and accounts for roughly 11-15% of total CPM. A new Class 8 truck purchased at $175,000 that sells for $55,000 after 5 years and 500,000 miles has a depreciation cost of $0.24 per mile. A $45,000 light-duty van that sells for $15,000 after 4 years and 80,000 miles depreciates at $0.375 per mile.

Depreciation is a fixed cost in the sense that it accrues whether you drive the vehicle or not. But the per-mile impact is directly tied to utilization. An underutilized truck that sits idle 40% of the time has nearly double the depreciation cost per mile compared to one running at 85% utilization. This is why fleet right-sizing — eliminating vehicles that don't earn their keep — is one of the fastest ways to reduce overall CPM.

Administrative and overhead costs

Administrative cost per mile tends to be higher for smaller fleets because overhead doesn't scale linearly. A 10-truck fleet and a 100-truck fleet both need a dispatcher, a safety manager, and fleet management software. Spreading that cost across 10 trucks versus 100 produces a very different per-mile figure. This is one reason larger fleets often report lower total CPM — they have structural advantages on the overhead line.

Fleet cost per mile breakdown table

<em>Source: <a href="https://truckingresearch.org/2024/11/05/an-analysis-of-the-operational-costs-of-trucking-2024-update/" target="_blank" rel="noopener noreferrer">ATRI An Analysis of the Operational Costs of Trucking, 2024 Update</a>. Figures represent averages for line-haul truckload carriers. Your fleet's breakdown will vary based on vehicle class, operating model, and region.</em>

How to calculate cost per mile for your fleet

Fleet cost per mile is calculated by dividing total operating costs by total miles driven. The formula is simple: CPM = Total Operating Costs ÷ Total Miles Driven. The challenge isn't the math — it's capturing all the costs accurately and consistently. Here's how to do it right.

Step 1 — Gather your total operating costs

Start by pulling every cost associated with your fleet for the measurement period (monthly or quarterly). Include fuel purchases, driver wages and benefits, maintenance and repair invoices, insurance premiums, vehicle depreciation (actual, not accounting), licensing and registration fees, tolls and permits, technology subscriptions (ELD, TMS, fleet software), and allocated overhead (dispatch, compliance, management). Miss a category and your CPM will look artificially low. The most commonly missed items are allocated overhead labor and the real depreciation cost of vehicles you own outright.

Step 2 — Capture total miles driven across your fleet

Step 3 — Divide total costs by total miles

Step 4 — Break it down by cost category

Step 5 — Compare per-vehicle and per-route CPM

Once you have fleet-level and category-level CPM, calculate it per vehicle and per route. Per-vehicle CPM reveals your worst performers — the trucks that cost far more per mile than the fleet average. These are candidates for replacement, heavier maintenance attention, or reassignment. Per-route CPM reveals unprofitable lanes, routes with excessive dead miles, and customer deliveries that are costing you more than the revenue they generate.

Fixed vs variable costs in fleet cost per mile

Understanding the fixed-variable split in your CPM is critical for decision-making. Fixed costs accrue regardless of miles driven. Variable costs scale with usage. Most fleets have a roughly 35-40% fixed / 60-65% variable cost split, but this ratio shifts significantly based on utilization and fleet size.

Which costs stay flat regardless of miles driven

Fixed costs include depreciation, insurance premiums, licensing and registration, lease payments, and most administrative overhead. A truck that sits in the yard all month still depreciates, still carries insurance, and still has a lease payment due. These costs don't change whether the vehicle runs 10,000 miles or zero miles in a month. The per-mile impact of fixed costs decreases as utilization increases — which is why driving more miles (productively) actually lowers your CPM.

Which costs scale directly with mileage

Variable costs include fuel, tires, most maintenance items (oil changes, brake wear, filter replacements), tolls, and per-mile driver pay. These costs increase proportionally with miles driven. A truck running 120,000 miles per year will consume roughly twice the fuel and wear through tires twice as fast as one running 60,000 miles. Variable costs per mile tend to stay relatively stable — your fuel cost per mile doesn't change much whether you drive 80,000 or 120,000 miles in a year (assuming similar routes and conditions).

Why the fixed-variable split matters for fleet decisions

The fixed-variable ratio determines how your CPM responds to changes in utilization. If your fleet is heavily loaded with fixed costs (high depreciation, expensive leases, large admin staff), increasing utilization is the fastest CPM reduction lever. Every additional productive mile driven spreads those fixed costs over a larger denominator. If your fleet is variable-cost heavy (older vehicles with high fuel and maintenance costs), reducing per-mile operating costs through fuel efficiency and preventive maintenance has a bigger impact than adding miles.

Fleet cost per mile benchmarks by vehicle type

Fleet CPM varies dramatically by vehicle class, operating model, and region. Using ATRI's trucking average of $2.27/mile as a benchmark only makes sense if you're running Class 8 line-haul operations. Light-duty fleets, last-mile delivery operations, and specialized vehicles have very different cost structures.

Light-duty vehicles and passenger fleets

Light-duty fleet vehicles (sedans, SUVs, pickups, minivans) typically cost $0.50-0.85 per mile all-in. Fuel is a smaller percentage of total CPM for these vehicles because of better fuel efficiency (20-30 MPG). Depreciation and insurance make up a larger share. According to <a href="https://www.aaa.com/" target="_blank" rel="noopener noreferrer">AAA's 2024 Your Driving Costs study</a>, the average cost of owning and operating a new vehicle in the U.S. is $0.734 per mile, or $12,182 annually based on 15,000 miles. Fleet vehicles typically come in lower due to volume purchasing discounts and fleet insurance rates.

Medium-duty trucks: Class 4-6

Medium-duty trucks (box trucks, stake beds, smaller flatbeds) generally run $1.10-1.75 per mile depending on age, fuel type, and operating profile. These vehicles often serve regional and local delivery routes with lower annual mileage (30,000-50,000 miles/year), which pushes fixed cost per mile higher. Maintenance costs per mile are moderate — less complex than Class 8 trucks but more expensive than light-duty vehicles. Fuel efficiency typically ranges from 8-14 MPG depending on load and terrain.

Heavy-duty Class 7-8 trucks and tractor-trailers

Heavy-duty operations are where the ATRI $2.27/mile average applies most directly. Long-haul tractor-trailers running 100,000+ miles per year typically fall in the $1.90-2.50/mile range. Regional operations with more stop-and-go and lower utilization can run $2.30-2.80/mile. Specialized haulers (refrigerated, tanker, oversized) often exceed $2.50/mile due to equipment costs, lower fuel efficiency, and permit requirements.

Last-mile delivery vans and box trucks

CPM benchmark table by vehicle class

<em>Sources: <a href="https://truckingresearch.org/2024/11/05/an-analysis-of-the-operational-costs-of-trucking-2024-update/" target="_blank" rel="noopener noreferrer">ATRI Operational Costs of Trucking 2024</a>, <a href="https://www.aaa.com/" target="_blank" rel="noopener noreferrer">AAA Your Driving Costs 2024</a>, fleet industry benchmarks. Ranges reflect variations in geography, fleet size, and operating efficiency.</em>

How to reduce fleet cost per mile without cutting service quality

Reducing CPM is about surgical improvements across multiple cost categories, not slash-and-burn cuts to a single line item. A fleet that reduces fuel CPM by 8%, maintenance CPM by 15%, and overhead CPM by 10% can lower total cost per mile by $0.15-0.25 — without sacrificing service reliability or driver satisfaction.

Attack fuel costs first — the biggest CPM lever

Fuel is the most immediately actionable CPM category. Concrete steps that produce measurable savings within 30-60 days: negotiate fuel card discounts (most national programs offer $0.05-0.15/gallon off retail), implement an anti-idling policy (one hour of idling burns 0.8-1.0 gallons of diesel — that's $3-4 per hour wasted), use telematics to identify and coach high-idle drivers, and plan fuel stops at cheaper locations using tools like <a href="https://www.fuelman.com/" target="_blank" rel="noopener noreferrer">Fuelman</a> or fleet fuel optimization platforms.

Speed management is another fuel lever most fleets underuse. According to the <a href="https://www.energy.gov/eere/vehicles/fuel-economy" target="_blank" rel="noopener noreferrer">U.S. Department of Energy</a>, every 1 MPH increase above 55 MPH reduces fuel economy by 0.1 MPG for heavy-duty trucks. A fleet that reduces average highway speed from 68 to 63 MPH can improve fuel economy by roughly 0.5 MPG — saving approximately $0.04/mile at $3.80/gallon diesel.

Shift maintenance from reactive to preventive

Reactive maintenance costs 3-5x more per incident than preventive maintenance, and it comes with downtime that doesn't show up on the repair invoice. A roadside breakdown that costs $1,500 in tow and repair charges also costs $800-1,200 in lost revenue, late delivery penalties, and driver detention. Fleets with PM compliance above 90% typically see maintenance CPM 25-30% lower than those running reactive programs.

Optimize routes to cut dead miles

Dead miles (miles driven without a load or without generating revenue) are pure cost. For-hire carriers average 10-15% deadhead miles, according to ATRI. Every deadhead mile carries the full variable cost (fuel, tires, wear) with zero revenue. Reducing deadhead from 15% to 10% on a fleet running 10 million annual miles eliminates 500,000 unproductive miles — roughly $275,000-500,000 in annual savings depending on vehicle class.

Right-size your fleet and eliminate underutilized vehicles

Underutilized vehicles are CPM killers because they carry full fixed costs (depreciation, insurance, registration) across very few miles. A vehicle running 40% utilization has nearly twice the fixed cost per mile of one running 80%. Identify vehicles consistently below 60% utilization and evaluate whether they can be eliminated, shared across departments, or replaced with rentals during peak periods.

According to <a href="https://www.nafa.org/" target="_blank" rel="noopener noreferrer">NAFA Fleet Management Association</a>, the average commercial fleet has 15-20% more vehicles than it needs. Removing even 5 underutilized vehicles from a 50-truck fleet eliminates roughly $150,000-250,000 in annual fixed costs — which reduces your fleet-wide CPM even before you touch a single variable cost line.

Negotiate insurance and review coverage annually

Insurance is a fixed cost that many fleet managers treat as non-negotiable. It's not. Get competitive quotes annually from at least three carriers. Implement dash cams and document the reduction in at-fault incidents — insurers respond to hard data. Raise deductibles where your loss history supports it. Bundle policies (auto liability, cargo, general liability, workers' comp) with a single carrier for multi-policy discounts. A fleet that reduces insurance cost from $0.12/mile to $0.09/mile saves $30,000 per truck per year on a vehicle running 100,000 annual miles.

Tools and software for tracking fleet cost per mile

Tracking CPM manually in spreadsheets works for small fleets but breaks down as you scale. Dedicated fleet management and telematics platforms automate data collection and calculate CPM in real time across vehicles, routes, and cost categories.

Fleetio: maintenance-driven CPM tracking for small and mid-size fleets

<a href="https://www.fleetio.com/" target="_blank" rel="noopener noreferrer">Fleetio</a> tracks fuel entries, maintenance costs, and vehicle lifecycle expenses and calculates cost per mile automatically. It pulls odometer data from fuel entries and integrations to maintain accurate mileage records. Fleetio's reporting dashboard breaks down CPM by vehicle, vehicle group, and cost type. Pricing starts at $5/vehicle/month for the basic plan, making it accessible for fleets as small as 10 vehicles.

Motive and Samsara: telematics-based cost analytics

<a href="https://www.gomotive.com/" target="_blank" rel="noopener noreferrer">Motive</a> (formerly KeepTruckin) and <a href="https://www.samsara.com/" target="_blank" rel="noopener noreferrer">Samsara</a> combine ELD, GPS tracking, and fleet analytics in a single platform. Both capture real-time mileage, fuel consumption (via engine diagnostics), idle time, and vehicle utilization data — the inputs you need for accurate CPM calculations. While neither is primarily a cost-tracking tool, their data feeds into fleet management platforms or can be exported for CPM analysis. Motive pricing starts around $25-35/vehicle/month; Samsara runs $30-45/vehicle/month depending on configuration.

Spreadsheet vs software: when to upgrade your CPM tracking

Spreadsheets work fine for fleets under 15-20 vehicles where one person manages fuel receipts and maintenance invoices. Beyond that, manual data entry creates gaps, delays, and errors that make your CPM data unreliable. Signs you've outgrown spreadsheets: your CPM calculations are more than 30 days old by the time you see them, you can't break down CPM by vehicle without hours of work, fuel data isn't matched to specific vehicles, and maintenance costs are tracked in total rather than per vehicle.

At $5-10/vehicle/month for fleet management software, the ROI calculation is straightforward. If software-driven CPM visibility helps you find and fix $50/month in waste per vehicle (a conservative estimate), the return is 5-10x the cost of the platform.

Comparing your CPM to industry averages — what the data tells you

Benchmarking your fleet's CPM against industry data gives you a baseline for evaluating performance. But benchmarking requires comparing like with like — a local delivery fleet shouldn't measure itself against ATRI's line-haul numbers, and a 10-truck fleet shouldn't expect the same overhead cost per mile as a 500-truck carrier.

ATRI operational costs of trucking: the benchmark that matters

The <a href="https://truckingresearch.org/2024/11/05/an-analysis-of-the-operational-costs-of-trucking-2024-update/" target="_blank" rel="noopener noreferrer">ATRI operational costs of trucking report</a> is the most widely cited CPM benchmark in the industry. Published annually, it surveys carriers of all sizes to calculate average costs across every major category. The 2024 report covers 2023 operating data and puts the average at $2.27/mile. Key trends from recent ATRI reports: fuel costs dropped from their 2022 peak but remain elevated, driver wages continue to climb 3-5% annually, insurance is the fastest-growing cost category, and maintenance costs are rising as the average fleet age increases.

Regional differences in fleet cost per mile

CPM varies significantly by operating region. The West Coast and Northeast are the most expensive operating areas due to higher fuel prices (California diesel averages $0.40-0.80/gallon above the national average), higher insurance premiums, more toll roads, and stricter emissions regulations that increase equipment costs. Fleets operating primarily in the Midwest and Southeast typically report CPM 10-15% below the national average. Cross-country operations that touch multiple regions tend to fall near the ATRI national average.

How fleet size affects cost per mile

ATRI data shows that larger carriers generally report lower CPM than smaller ones. Fleets with 100+ trucks benefit from volume fuel discounts ($0.10-0.20/gallon below retail), fleet insurance rates, bulk parts purchasing, and administrative cost spread across more vehicles. Owner-operators and small carriers (under 20 trucks) typically see CPM $0.15-0.30 higher than large carrier averages. However, small fleets can partially offset this disadvantage through fuel card cooperatives, group purchasing organizations, and lower overhead if the owner handles management functions personally.

Frequently asked questions about fleet cost per mile