What one change or tool cut unplanned downtime or maintenance costs for your fleet — and how did you measure it?

Looking for short, practical case examples: name a single operational change or tool (e.g., a CMMS rollout, telematics rule, parts‑inventory heuristic, shift scheduling tweak, PM interval change, tech training, or vendor consolidation) that meaningfully reduced unplanned vehicle downtime or lowered maintenance costs for your fleet. For each example, please include:

- Fleet context: size, primary vehicle types, and operating environment
- The change or tool implemented (one sentence)
- The measurement approach and metrics used (before vs after): e.g., downtime hours/vehicle/month, mean time between failures (MTBF), mean time to repair (MTTR), maintenance cost per mile, parts stockouts, technician utilization
- Timeframe to see results and the magnitude of the improvement (percent or absolute numbers)
- Key implementation steps, what worked, and what didn’t

If possible, attach or link anonymized templates, KPIs, dashboards, or calculation notes. Tag which category applied (telemetry/CMMS/inventory/scheduling/training/vendor). Real first‑hand experience only — please don’t summarize vendor claims. Looking to build a set of repeatable playbooks, so practical specifics and measurable outcomes are most helpful.