[DifferentPointofView]

I don't know if this info is totally correct... but...

The relatively tiny stature of the rotary engine allowed for a much lower hood line, as well as a low sitting front fascia, which nearly comes to a point. The windshield and roof line were also tested heavily in the wind tunnel to yield the lowest possible coefficient of drag without making the interior head room seem ridiculously cramped. The headlights are a hideaway flip up style which helps to bolster the already excellent aerodynamic effect of the front end. All of these features put together help the first generation RX-7 to yield a minute 0.36 coefficient of drag, which was as good as the Porsche 924 of that era, and even with the headlamps open, the coefficient of drag only increases to 0.38, which is equivalent to the drag of one of its nearest competitors, the Datsun 280Z.

original link http://www.mazdaforum.com/mazda/rx-7.asp