The first big hurdle is to start designing for efficiency rather than aesthetics. I prefer function over form, but unfortunately, the only automotive arena where that is actively pursued is in the performance car segment. That is why the Gen I Insight was so ahead of its time. It costs auto manufacturers money to design and build for efficiency, but efficiency doesn't make money. People can complain about CAFE all they want, but without a compelling reason, auto manufacturers have no motivation to design for efficiency. If they did, they'd eat the extra couple hundred dollars to equip every car from factory with a full, smooth aluminum underbelly panel.
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