Industrial machinery fleets in Ghana are characterized by a high level of operational inefficiencies due to outdated maintenance practices and lack of standardization. A quasi-experimental design was employed to assess the impact of standardised maintenance protocols and fleet management systems on operational efficiency. Data were collected over a period of one year using structured surveys and performance metrics. Significant improvements in machinery uptime (average increase of 15% across fleets) and reduced maintenance costs ($20,000 annually per fleet) were observed after the implementation of standardised protocols. The quasi-experimental design proved effective in quantifying efficiency gains without requiring controlled experiments or random assignment. The findings suggest a clear path for improving industrial machinery fleet performance through standardization and systematic maintenance practices. Industrial operators should consider implementing standardised maintenance procedures and fleet management systems to enhance operational efficiency and reduce costs. industrial machinery, fleet management, quasi-experimental design, efficiency gains, Ghana The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.