We end with an unofficial season average of
11.132 million viewers (5th highest)
3.375 in adults 18-49 (3.4 basically).
Now on this, since I don't have numbers for all episodes and seasons (unlike viewers). But since moving to Sundays this is the third best (seasons 10 and 12 beat it). But its better then the 3 of the seasons and with a vastly depressed Sunday (for CBS) it is exceptionally good.
Since TAR moved to Sunday, are the fall ratings better than the spring reasons? 
Yes, but that is typical of TV in general. Though in fairness it actually started the year before with season's 8 - 9.
The only other possible comparisons is seasons 1 -2 (but I hate to judge season one, since a good portion of that season was heavily impacted by the change in viewership due to 9-11). And then we had the late summer to Spring stretch of seasons 5,6 and 7 (what a great year for TAR). BUt with the advent of stunt casting off of the far more successful survivor (which was hitting 10 million more viewers then TAR at that time), it also makes it unfair to use that (as season 7 was in the Spring).
So we should expect a good drop in the spring, not only do we have little help from sports (for CBS in general, though Basketball usually helps for about 4 weeks), we get hit hard by the Oscars (typically the lowest broadcast for TAR of that year, and we might even get hit by the Olympics depending on when we start. Then we also will have to deal with having a much lower turnout for CBS on Sunday to begin with (with the failure of its 9 and 10 programming.
Of course, the good side of that is TAR even with lower numbers will still stick out from the rest of the CBS lineup.
Truly if anything CBS should learn its lesson and bump up its order of hours for TAR. With either (hell both would be nice) going back to two hours for the first leg (not two episodes, but two hours), which they have done in seasons 5,6,7,8,9 (4 and 10 had 90 minute episodes). And bump the episode order back up to 13 (I mean I am happy they went up to 12 (truly I am). Hell they could even increase the final leg into two hours (they have aired two episodes for the finale, but never have they actually had a two hour final leg).
The cons of adding an leg is that it is expensive (longer time holding people, travel expenses, more stunts and tasks, ect).
The pros for upping the opener or the closing leg (to two hours) is that it adds almost no additional cost. Its just more post production and editing. And they can reap much larger ad rates then what will most likely be airing when TAR isn't. Season 12 proved without a doubt that TAR could still be huge for CBS during the off season.
