mevans-
Despite the dire warnings you may hear from other posters on this board, it is HIGHLY unlikely you'll get caught.
I'd say an average of 1.5 to 2.5 cents per mile is the going rate. You can sell to local small companies who don't want to pay the full fare of say, HSV to LGA = $800+. Your 25,000 @ $400 makes both of you very happy.
Just some thoughts...not advocating it. But, they are yours to do with as you wish.