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I think that the gas Sky-Active (sp?) engines also run compression ratios around 14:1. Oddly enough, I have seen several sources that suggest that is close to the optimum ratio for efficiency before the losses start to outweigh the gains with higher ratios.
I suspect that a lot of Mazda's thinking on ICE fuel efficiency has been worked through with the Wankel. They have done some interesting things with them. What comes to mind are the 6-port engines (the Wankel equivalent of variable valve timing) and shutting off the venturis for one of the rotors on decel. on some of the pollution controlled12a's.
Don't they also have an ultra-capacitor based KERS battery/alternator charge system?
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