[IgorPartola]

I think you are misreading that. The increase of 10-30 percent is in torque, not MPG.

[ddeck]

This is correct, but they're are also predicting an equivalent improvement in fuel consumption:

"Compared to the current lineup of SkyActiv-G engines, the SkyActiv-X line should use between 20 and 30 percent less fuel."

http://newatlas.com/mazda-skyactiv-x-compression-ignition/50...

[flamedoge]

more torque = less rpm @ same hp?

[toxik]

Torque is directly proportional to power, related by angular velocity. So τ Nm of torque at angular velocity ω rad/s will give you power P = τ·ω in watts. In fact this works for three-dimensional τ and ω if · is the scalar product.

Oh and an RPM of N is equivalent to angular velocity ω = N·π/30.

[Danihan]

Gah, you're right, thanks. Edited.