One of the knocks against hybrids is that they're best around town, but once you get on the highway, it's back to full-time fossil fuels. Nissan is developing its own hybrid tech that it plans to launch in the Infiniti FX, in which the electric component will assist the engine at highway speeds as well, not just around town.
We don't know how close, if at all, it will be to the hybrid system in the Porsche Cayenne -- that (as-yet-untested) one can run the vehicle entirely on electric power at 75 MPH. Nissan's offering is slated to arrive some time in the next decade, presumably in the next generation FX. When it does, that will put at least four different types of major manufacturer hybrids on the roads, making their way through streets also littered with clean diesels. When we get that kind of concentration, the shakeout will really begin to decide who'll win the altpower war.