Dude, the speed limit is awful slow. I usually drive 5-10 over and I think that's reasonable on a city street or the highway, lets not talk about back roads.
I can't say I notice anything different though because people in MI always drive like idiots. I was going home yesterday with my friends (in an Accord coupe w/ I/E not that it matters) and we tucked behind an Escalade doing about 110 for around ten minutes, then passed him doing around 125. That's how my friend always drives and it's not terribly unusual to find others doing it too.
http://www.srtforums.com/forums/show...threadid=21921
JC