Any list of “dearly departed” road cars cannot be complete without mention of the storied Mazda RX-7. For many enthusiasts, it was the pinnacle of Japanese sports car engineering, and much of that boiled down to its very special (and high-revving) Wankel rotary engine.  Mazda famously ended production of the Wankel in 2012, not particularly because it wanted to, but because it had to. The last-gen “Renesis” unit failed to pass muster in European emissions testing. Since then however, Mazda  ...