I understand what you're asking, but if you sit down and really think about actually installing a 2nd transmission, it's a ridiculous concept. Wastes energy, extra weight, complexity, reliability issues.
Besides, the 65 mpg that the Aero Sprite achieved is not all that impressive these days.
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Aerospace Controls Engineer.
Currently driving a mostly stock 2014 Mitsubishi Mirage DE hatchback.
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