i had the origional mazda rx-7 in the early 90's.....110K trouble free miles on it..not much low end power but pulled like a freight train in the mid/upper rpm ranges.
the rest of the car held up quite well, for the time period espically.
rotary engine do use more oil than a conventional piston engine, true..part of their nature. don't recall it being excessive consumption, though.
a very quiet and vibration free engine.
any questions, feel free to PM me.