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No in real world environment the mass velocity is constantly being changed by the user. I have two Prius and how mine is used highway and especially in town the mean cost is far less in the lighter vehicle. Even a Mercedes with Cd of 22 and a chassis and running gear of 1400kg is no good to me. Making lighter parts from non ferrous materials is the way I will go. In the UK, registration points mean you can change the chassis, suspension, steering, engine, transmission up to 8 before change of use
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