No one in the USA cares about fuel economy. Everyone wants trucks and SUVs. The first version of the engine is a 2.0 that's good in the smaller vehicles, and Mazda was supposedly working on a 3.0 turbocharged inline-6 for a new RWD version of the 6, and a new SUV based on that. Recent talk is that the RWD cars are basically canceled because reasons that don't really make sense.They will probably bring the X to the USA once it gets some real world miles under it. I think companies are afraid to try new things in the US because once it gets set in minds here about something it's hard to fix it. They wouldn't want the engine to get a bad reputation here. Hell, it took GM 30 years to bring back diesel in a sedan.