Must admit, I haven't paid much attention to this issue, but since all the discussion about it here, I looked it up and here is a chart I found. My apologies, if someone already put this up, at some other time.
http://www.sportsbettingacumen.com/h...eout-chart.asp
I thought the jump in takeout from exactas to tris and other multi horse wagers was interesting. About 3 to 6 percentage points, if I am reading that right, just about everywhere.