Recently, with the talks about trading Jefferson, I've seen a couple of people distraught over the thought of moving Jefferson cite his production while playing with good wings as a reason to keep him. Each time Jefferson's January stretch before his ACL tear was mentioned. This bugged me because I've looked up the numbers before at Basketball Reference, and based on just looking at them, they didn't seem much better than his usual. So, being the giant nerd that I am, I took the time to check to see if I was wrong. I added up all of his game numbers and averaged them out.
These are his stats for the 19 games before his injury (14 in January, and 5 in February), his season averages for 08-09, and his season averages for 07-08 (when he played all 82 games):

As you can see, Jefferson wasn't a better scorer in that stretch and he wasn't more efficient. In fact, most of his numbers were worse than his season averages.
The team won a higher percentage of their games in that stretch than their average for that year, but I'm not sure that you can attribute many of those wins to Al (his offense at least).