I don't want it for the extra HP... i wanted it for the fuel efficiency, i'd love to be able to drive from Sydney to Melbourne on one tank. I'd also like a better sound from the engine, I don't know if the same engine design with DI will make a difference to the sound however. Just a hope really.

The improved fuel economy will be minor at best. The current 370 can get almost 500mi (highway) on a single tank as-is. As for engine noise, just get an intake and catback exhaust. Sounds sweet :)

All car manufactures are doing it. Nissan should just put it to use for the z so it can have more power.