Fleet Maintenance Cost Per Mile: Benchmark Guide & Calculator

The 2026 ATRI Analysis of the Operational Costs of Trucking (analyzing 2025 data across 178,091 Class 8 trucks and 14.08 billion miles) sets the industry-average maintenance cost per mile at $0.215 — up 8.6% from $0.198 per mile in 2024. This represents approximately 8.9% of total operating costs and equates to roughly $16,200 per heavy-duty truck per year at industry-average utilization. The ATRI benchmark covers parts, shop labor (in-house and outsourced), aftertreatment service (DPF cleaning, DEF system), diagnostic labor, and roadside repair — but excludes tires (tracked separately at $0.051/mi), towing and recovery, fuel, and body shop / collision repair. Fleets comparing internal CPM to the ATRI benchmark should verify their calculation uses the same inclusion boundaries. Top-quartile fleets consistently hit $0.12-$0.18 per mile through PM discipline and fleet-age management. Bottom-quartile fleets exceed $0.30 per mile driven primarily by aging equipment and high reactive-repair ratios. The 60-150% gap between top and bottom quartile fleets is the largest single opportunity in fleet cost management — larger than fuel economy programs, larger than driver retention programs, larger than insurance premium optimization on a per-mile basis. Regional operating environment also affects CPM: fleets operating primarily in the Northeast run 12-18% higher CPM than fleets in the South Central US due to weather stress on equipment, toll structures, and dealer labor rates.

Maintenance CPM equals total annual R&M costs divided by total annual fleet miles, calculated on a rolling 12-month window for stability. Step 1: Sum all R&M line items across the fleet — scheduled PM, unscheduled repair, parts (OEM and aftermarket), shop labor (internal at fully-loaded technician cost, external at invoiced rate), aftertreatment service, diagnostic labor, and roadside repair. Include internal shop time as a real cost, not just direct labor — a $28/hr technician at fully-loaded cost with benefits, tools, and shop overhead runs $55-75/hr; using the wage rate alone under-reports true CPM by 30-40%. Step 2: Exclude tires (industry standard tracks separately at $0.051/mi), fuel and DEF (separate category), towing and recovery (separate line item), body shop / collision repair (not maintenance), vehicle detailing, fleet management software, and insurance claims for vehicle damage. Step 3: Sum all fleet miles from telematics ECM-reported odometer readings. Do not use billing miles, dispatched miles, or estimated miles — telematics odometer is the only defensible source. Include empty miles because trucks accumulate wear whether loaded or not. Use rolling 12-month window (not calendar year) for stability. Step 4: Divide costs by miles. Step 5: Also calculate per-truck CPM to identify outlier equipment driving fleet variance. Fleet-wide CPM plus per-truck CPM together give management the diagnostic picture needed for decisions. Digital fleet analytics platforms automate all five steps from telematics + work order + parts inventory integrations.

Fleet age is the single biggest driver of maintenance CPM variance. Fleetio's 2025 benchmark data documents that CPM increases 35% for vehicles over 10 years old versus vehicles under 5, and industry data consistently shows an even steeper curve at extreme ages. Rough breakdown by truck age: Years 0-2 (under warranty): $0.06-0.11 per mile — major components covered, only routine PM out-of-pocket. Years 3-5 (post-warranty, low mileage): $0.12-0.17 per mile — normal wear items begin failing, but powertrain remains reliable. Years 6-8 (mid-life): $0.18-0.26 per mile — aftertreatment service cycles begin, injectors and turbos start requiring attention. Years 9-11 (aging): $0.28-0.42 per mile — major component overhauls likely, powertrain repair costs accelerate. Years 12+ (end-of-life): $0.45-0.75 per mile — trucks approach or exceed cost-to-replace on the year, reactive repair dominates spend. The curve isn't linear; it accelerates. This is why replacement cycle optimization is the single most valuable fleet CFO decision. Trading trucks at the 5-7 year / 500-700K mile inflection point keeps fleet-wide CPM in the low-cost portion of the age curve. Running to 10+ years accepts high R&M in exchange for lower equipment payment cost, but the R&M premium usually exceeds the payment savings. Fleet CFOs should model expected CPM by truck-year across the fleet's age distribution to project multi-year maintenance budgets accurately.

The reactive-vs-planned ratio measures what percentage of R&M spend responds to breakdowns already occurred versus scheduled preventive service caught before failure. It's the strongest leading indicator of where CPM will trend over the next 12 months. Top-quartile fleets: under 20% reactive — 80%+ of R&M spend goes to scheduled service. PM compliance 95%+. Unplanned downtime under 5% of available hours. CPM typically $0.12-0.18 per mile. Industry-average fleets: 30-45% reactive. PM compliance 70-85%. Unplanned downtime 8-12%. CPM $0.20-0.24 per mile — ATRI's $0.215 benchmark sits in this zone. Bottom-quartile fleets: 55%+ reactive. PM compliance under 60%. Unplanned downtime 15%+. CPM exceeds $0.30 per mile. The economic math is severe: an emergency repair costs 3-5x the same fix caught at scheduled PM. A brake system service on a scheduled PM might run $800-$1,200; the same brake failure roadside costs $2,400-$6,000 in road service plus dispatch impact plus driver dead-time plus potential customer service failure. Move the reactive ratio down and CPM follows in 6-12 months. This is why digital PM platforms with hour/mile-triggered work orders produce the largest measurable CPM improvements — they mechanically shift the reactive/planned mix by making scheduled service the default and reactive the exception. Fleet management platforms that don't track the reactive/planned ratio explicitly are missing the leading indicator that predicts CPM direction.

No — duty cycle materially affects maintenance CPM, and fleet CFOs comparing performance across segments need duty-cycle-specific benchmarks rather than blanket ATRI averages. Long-haul (over-the-road, primarily highway operation): typical CPM $0.16-0.20 per mile. Steady-state highway operation produces the lowest per-mile maintenance cost because the powertrain runs at optimal RPM band, thermal cycling is minimal, and brake usage is light. Regional (dedicated routes, mixed highway and city): typical CPM $0.20-0.26 per mile. More start-stop cycles, more brake usage, more transient loads on aftertreatment. Less-than-truckload (LTL, high stop-count): typical CPM $0.22-0.28 per mile. Extreme stop-and-go, curbside operation, tighter driving environments cause elevated brake and body wear. Vocational (dump, mixer, refuse, construction): typical CPM $0.28-0.38 per mile. Off-highway operation, extreme load cycles, extended PTO idle time, and harsh operating environments produce the highest per-mile maintenance cost. Refrigerated: typical CPM $0.22-0.28 per mile — additional trailer reefer unit maintenance adds to the total. Owner-operator small fleets: typical CPM $0.20-0.28 per mile — higher outsourced labor rates offset by strong PM discipline. Fleet CFOs benchmarking across segments should segment their own fleet by duty cycle and compare each segment to its appropriate industry benchmark rather than fleet-average against ATRI's blended $0.215 figure — which is dominated by long-haul truckload operations and can mislead multi-segment carriers.