I thought the Governor is limited on gear selection and revs and not actual speed. Thats why their is a + or - of 4-5 MPH depending on the exact set timing and grind of the cams.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)