Displacement measurements are how much of the air and fuel mixture the engine movies within one cycle, or one rotation of the crank shaft. The geometry of the Wankle rotary is such that the crank shaft revolves three times for every one revolution of the rotor. Each rotor displaces 654cc for each side, or each cycle of the crank, and since the stock RX-8 of today employs a 2-rotor Renesis engine, that equates to 1308cc, or 1.3L for each crank cycle. This engine in the RX8 produces 237hp.

I will agree that it all depends on how you do your displacement classification, but the official classification for the RX8 is 1.3L.

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2001 Chevrolet Monte Carlo SuperSport