I'm combining the discussion in two different threads here for a wider audience. Help me out here—I've spent a grand total of 6 days of my life in Detroit so I have no personal experience in how to pronounce Lafayette. You good DY folks are all I have.

Eastside Al told me it's La-FAY-ette
kanfar says he's never heard it pronounced that way.
The State of Michigan says it's lä-fā-ET [[laugh-ay-YET), but I realize that things may roll a little different in Detroit than what Lansing may believe.