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The Miller Cycle engine has nothing to do with a rotary—the Mazda one in discussion was a V6. I'd hate to see a rotary in the Miata, unless it was an option only, as I like the idea of a sports car with a durable engine and the capability of getting decent mileage without using more oil than sleeve valves. V8 fuel efficiency with lawn mower torque and 2-stroke oil consumption in exchange for some smoothness never seemed like a good trade to me. Some Honda engines rev high, too, but use much less fuel and regularly run for 200k miles without a problem.
That and it's just ridiculous to have to have the entire engine spin around a fixed crankshaft, requiring the wheel to be bolted right to the engine block! (that's a joke about the original aircraft rotary engine)
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