Mazda did market a Miller Cycle engine with a supercharger, I believe. But Atkinson has nothing to do with the Wankel rotary. Rotaries are designed to be fuel hogs so nothing has been attempted to reduce their fuel usage.
Atkinson cycle was just a competitor's attempt at making a gasoline engine that didn't infringe the Otto cycle copyright. At least so I understood. The basic engine running on Atkinson cycle is similar to an Otto cycle engine, what is necessary to convert is where we're stuck.
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-Allch Chcar
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