I got an average of 27 mpg out of the Auto zetec Mystique.

Worst 24 Best 29.5

And now I get 25 mpg Out of my SVT. Keep in mind that the SVT has a Duratec with a little weaker low end and a high gear ratio that makes the engine rev to high on the highway.
A normal Duratec I'd imagine would get a little bit better gas milage.

Worst 22, Best 26.