Looks like a GREAT ride, Pete!
I was in Mount Pleasant which you may have ridden through on your way to The Bridge.
Speed limits in Michigan ARE kinda weird. 127 is a main North/South route right up the center of the state. From Lansing North, the limit is 70 or 75 (miles, not K's) and several miles of it are just ordinary 4 lane road with NO LIMITED ACCESS! Gravel farm roads running right up and crossing! Scary.
When I was growing up around there as a kid in the 60's, that was 27, not 127 and I don't remember the speed limits being anything like that.
Sorry we couldn't get together, a little mis-communication on my part as I never planned on being in Michigan until Monday. Left Maine on Sunday and drove as far as the NY/PA border before I ran out of steam.
EDIT: The western end of NY where PA juts up to Erie.