Does anyone know what the 1.5 liter Vitz was rated at on the Japanese 10-15 cycle, or what the 1.5 liter varients of our xA/xB are rated in the 10-15? That way we can compare to the US models, since we know:

2005 Echo 5-speed: 35 / 42
2005 Echo 4-Auto: 33 / 39
2006 Scion xA 5-speed: 32 / 37
2006 Scion xA 4-Auto: 31 / 38

The xB is significantly worse at 30/34, probably due to either aero or different gearing. Either way, I don't see it as being a good comparison against the Vitz/Belta, so I'm going to ignore it for now. I would think that the Belta would compre most closely against the Echo. The Echo came with a fixed cam 1.5 liter and the Belta has a VVT-i 1.0 and 1.3 liter.

At the very least, I'd think it would be somewhere around 38/44 for the 1.3 liter Belta on the US EPA tests. There's no chance we'd get a 1.0 liter car in the US. The Belta would probably be a good fit in the Scion lineup because then it goes along with their other tiny, affordable Scions and in theory, it doesn't compete with the Prius because that's a Toyota and the Belta could be sold as the Scion xS or something. I think it could easily sell 2-3000 units a month with the peppy, rev-happy 1.3 liter VVT-i engine and 38/44 fuel economy.