My heart wants a Prius but my butt needed a seat quick so I bought a 2004 Ford Focus ZTS sedan. I've been reading up on the engine and exhaust system, pretty interesting. It's SULEV and when on California gas, PZEV. Furthermore, the 2.3L Duratec PZEV system is standard for the 2004 ZTS nationwide (in 2003 it was available only in the states with low emission requirements). So, it lays out about the same amount of emissions as a Prius, just without the high mileage. I like it a lot and I NEVER thought I would say that about a Ford!