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Once the focus of intense engineering scrutiny in the early 1990's, the major automotive companies suspended activity on 2-stroke engines because of perceived concerns over mechanical and emissions durability, and uncertain customer market acceptance. A 100-vehicle fleet, powered by the Orbital Combustion Process (OCP) air-assist direct fuel injected 2-stroke automotive engine, was launched into the Australian market to answer these questions. Homologated to Australian Design Rule (ADR) standards, the 2-stroke equipped vehicle fleet was distributed Australia-wide and exposed to a diverse range of driving styles and environmental conditions. Over three years, the Genesis ECOsport vehicles accumulated collectively in excess of 5.5 million kilometres with individual vehicles exceeding 160,000 km (or 100,000 miles). A brief overview will be given into the engine design, development and validation programs as well as vehicle build, validation, fleet management and data collection.