I don't think the 4.0 are bad at all. My old one would hang with this one til 60 and I used to routinely get 29 mpg on highway and occasionally 31-32 with modifications. I think the 3.7 is a Great upgrade but I still appreciate any mustang it's better than everyone driving prii.
@gmxblazer It's bad for me in the way that I'm a pretty lead foot driver, and I can see myself burning mpgs all in the name of some good driving fun with the 4L. Newer V6s not so much they don't have to work as hard. I avg 21 in the city and turn into Spongebob when no cars/cops are around
. Except I don't hit objects nor pedestrians.