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The concept of the hyMOD is, Mary, intriguing but... as both you and vbp1 say, complicated and expensive in the execution. vbp1's idea of the permanently installed microturbine is far better. As for the hyMOD concept, what would be wrong with it being more user friendly and convenient, as well as more economical, in that the engine/battery swap be done by the owner, should they want?