Mazda will show two engines at the Tokyo Auto Show, and both should end up being a very big deal in the U.S. market. You'll see them in Mazdas, and very likely, in Fords, too. 

First off, there's a new direct-injected version of Mazda's global 2.0-liter inline four-cylinder called the Sky-G. At least, that's what Mazda will call it during the Tokyo show. In addition, says Mazda, the engine block is revised to reduce mechanical friction and achieve the most optimal air-fuel mixture. Together, these improvements yield a claimed 15-percent improvement in fuel economy. This would enable a Mazda 3 to return mileage on par with a Mazda 2, according to the company.

The second engine is a new 2.2-liter turbodiesel four-cylinder. Yep, it's called Sky-D. It, too, has a new block that's less susceptible to friction. It also has piezo injectors and a two-stage turbocharger not found on Mazda's current European-market diesel. Total fuel economy improvement here is said to be 20 percent. This means you could drive around in a diesel Mazda 6 and get Mazda-2-like fuel economy, says Mazda. If this turns out to be true in real-world driving, the company will have to find a way to get this engine cleaned up for the U.S., as it could be a real help in meeting the 2015 CAFE standards.

The photo here shows you the Sky-G engine. You can take a look at the Sky-D after the jump.