{ "background": "Industrial machinery fleet management is a critical determinant of productivity and project delivery in developing economies. However, rigorous, evidence-based evaluations of systemic efficiency interventions within this sector are scarce, particularly in sub-Saharan contexts.", "purpose and objectives": "This study aimed to quantify the causal impact of a structured maintenance and telematics intervention on the operational efficiency of selected industrial machinery fleets. The primary objective was to isolate and measure efficiency gains attributable to the intervention using a quasi-experimental design.", "methodology": "A difference-in-differences (DiD) design was employed, comparing treatment and control groups of heavy equipment from construction and mining sectors. The treatment group received an integrated telematics and preventive maintenance protocol. Operational efficiency was measured via a composite metric of availability, utilisation, and mean time between failures (MTBF). The core statistical model was $Y{it} = \\beta0 + \\beta1 \\text{Treat}i + \\beta2 \\text{Post}t + \\delta (\\text{Treat}i \\times \\text{Post}t) + \\epsilon_{it}$, with inference based on cluster-robust standard errors.", "findings": "The intervention yielded a statistically significant positive treatment effect. The DiD estimator, $\\delta$, was 0.184 (95% CI: 0.112, 0.256), indicating an 18.4% improvement in the composite efficiency metric for the treatment group relative to the control. The effect was robust to multiple model specifications.", "conclusion": "The quasi-experimental analysis provides robust evidence that targeted, technology-augmented maintenance systems can generate substantial efficiency improvements in industrial machinery operations within the studied context.", "recommendations": "Fleet operators should prioritise investment in integrated telematics and data-driven preventive maintenance. Policymakers are encouraged to develop frameworks that incentivise the adoption of such efficiency-enhancing technologies across the industrial sector.", "key words": "fleet management, quasi-exper