....
Can anyone provide a link to references regarding reasonable mileage
made good for a given 24 hour period of sailing. ...

http://www.pangolin.co.nz/yotreps/reporter_list.php has a list of boats
actually making passages and the same list is kept historically. There
are programs you can download onto your PC that have rudimentary
mapping as well. You will need roll your own statistics. Keep in mind
that different people have different definitions of what a daily run
is. Record keepers and racers all pretty much agree that a daily run
is a great circle distance between two points in any 24 hours.
However, lots of cruisers prefer to define average day's run as the
distance between ports divided by the number of days between ports (ie.
distance made good on course per day).

-- Tom.