[recycled sixtie]

I remember when the rotary engine came out (in the '70's?) and thinking that the "normal engine" would be phased out because of too many moving parts. Hearing about fuel consumption explained the lack of popularity of the rotary engine.
I would think with this hybrid combo the fuel consumption hinges on the basis of how much time the rotary engine is running. If if I was driving it the rotary side would be full on speed limits permitting! Nice to dream though.