I get from 23-25mpg in mixed driving (60% highway) and I have a lead foot.
I have seen 30mpg in 100% highway driving.
I have a modified 00 SVT.
Fo ref - the wifes 2.4L DOHC ATX Cavalier gets 30-31mpg in mixed driving... Maybe 28mpg in city driving & 33mpg in 100% highway...
IMO I am not at all impressed with the Ford ATX.