Same here, my gas milage in the beginning was absolutely horrible. I was averaging about 13MPG.

But then in my last couple of fills, its been steadily increasing...probably by my calming down to how the turbo works.

The last time I checked for fuel consumption it was about 22.4 MPG. so not bad considering. 1600 Miles and no CheckEngine Light yay

 

Also all enginges need to be broken in. Maybe the low milage is a side effect of the Cx-7's not being broken in.