These engines are complete trash, which is why nobody else uses them. Mazda only does because of hardcore followers and/or marketing reasons (e.g. look we won le mans, or look this is the only way you can get a rotary!). Guzzle oil, guzzle gas, have no power, aren't reliable.
they use oil by design, so is that a fault? I guess it can be an inconvience. Funny watching rotary guys doing the calculation at the gas station for their premix.
They aren't all that efficient, but I have 4 banger than pulls a cool 11mpg so I think we are in the same ballpark
No power? My mechanic's kid makes over 500 whp with his FC. that was enough for him to run a 10.78 in a street car with a set of slicks
Now, I'll give you they aren't relatively reliable. But if you know what you are doing they are beyond simple to fix. I have been witness to a single person taking a non running rotory, pull the motor, rebuild and reinstall and get to a running car in a single night. sure, they might only go 80k miles and need a rebuild, but who really cares when parts will be about a grand and you can do the whole thing in 6-7 hrs?