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This is an assessment of current two-stroke automotive engine technology, implementation policy, vision, goals, and engine development and commercialization strategy. It includes a historical review of key two-stroke Otto cycle engine developments, a summary of the specifications for the new: Suburu Super 2-stroke, Toyota S-2 gasoline engine, Orbital two-stroke, General Motors GMCDS2 two-stroke engine and Industrial Technology Research Institute (ITRI) two-stroke engine test technology in Taiwan. Although two-stroke engine technology has been under development since the end of the 19th century, currently the only mass produced vehicles powered by two-stroke cycle engines are the Trabant and Wartburg, with 594 cc two cylinder and 993 cc three cylinder engines, respectively, essentially unchanged in cylinder configuration and porting since 1931.