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I've transplanted a NA 13B FC in my 1st Gen. I'm still messing with tune and it's definitely running a little rich, injectors I believe. The last tankful I was getting 26mpg. I've heard of guys getting as much as 30+ NA. I don't know under what conditions though. From listening to others mid 20s is pretty typical NA, turbos of course use more.
The handling is one of the shining points for Mazda. Perfect weight distribution in a light car makes for a fun time and RWD is the only way to go for handling, which is why most serious race teams run that way. They're a reliable engine if you take care of them. Don't ever run them low on oil or coolant. The oil is part of the cooling system. If you overheat a rotary you'll blow the seals. The engine is mostly just seals. Unless something is broken/damaged rebuilding one is mainly seal replacement (and mic'ing everything to make sure it's still in spec), little to no machining needed. An extra engine around is never a bad idea, for any car.
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