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"Pundits were suggesting that in the near future there would be plenty of cars with 0.25 and lower drag numbers. It seemed like a win/win change: since at speed by far the majority of power is used to push air out of the way, slipping more easily through that air results in more power available for acceleration and less overall fuel usage. And what with the huge investment in wind tunnels, the experience that aeronautical engineering could bring, and a new crop of stylists schooled in aerodynamics, well, it was all going to happen.
Except, it hasn’t."