A friend of mine was looking at one a few years ago, and compared it to a Mazda 3.
The Mazda handled like a "scapel" and the Mustang was like........."an axe....... with a loose handle."
Still, 6.9 sec. is pretty good. 25 years ago, we were all in awe because the top-of-the-line GT (302+ 5 spd) had the same 0-60 time.