I have been compiling a plethora of information based on Retrosheet data, and tonight I ran into some interesting results. Given that I never met a table I didn't like, I hereby present the all-time leaders in percent of regular season days spent in first place:

And here are the all-time worst:

No surprises in the leaders (the Yankees and Tampa Bay, who have spent a grand total of 24 days in first place) on those lists. However, the all-time best among defunct clubs, the American Association's Boston Reds, who spent over 83% of their time in first, would not be the first club one thinks of. (By the way, 25 defunct clubs have spent not one day in first, tying for the all-time worst.)

Now for the least amount of time in last place in whatever division or league configuration that prevailed at the time:

Now, the teams that spent the most time in last place:

To get a truer picture, let's look at the ratio of days in first to days in last:

Now the worst ratios:

Of course, the Phillies are the worst of the original 16 teams.

As for the average position for each teams, here are the best (not that expansion teams get a boost from being in smaller groupings):

Now the worst average position teams:

Ah, it makes one proud to be a Phillies fan. Will someone please contract my team and free me from this curse?