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This paper forms the third of a series and presents results obtained during the testing and development phase of a dedicated range-extender engine designed for use in a compact-class vehicle. The first paper in this series used real-world drive logs to identify usage patterns of such vehicles and a driveline model was used to determine the power output requirements of a range-extender engine for this application. The second paper presented the results of a design study. Key attributes for the engine were identified, these being minimum package volume, low weight, low cost, and good NVH. A description of the selection process for identifying the appropriate engine technology to satisfy these attributes was given and the resulting design highlights were described. The paper concluded with a presentation of the resulting specification and design highlights of the engine. This paper will present the resulting engine performance characteristics.