2 quick suggestions: first, draining the fluid and changing the filter only empties a little over 1/2 of the fluid in the CVT. After I did the drain/filter change, I drove it for a couple of days and did another drain and fill (obviously, no filter change). By now I have about 8 qts of new fluid versus 5.5 or so. Seems like a good idea.
Doing just a drain and fill, I put the car up on ramps, thinking that 'tilting' the car up would drain a little more fluid. I think I was right--I got nearly 6 qts. (after cooling) out doing it this way.
Lastly, when you order the fluid, I'd strongly suggest ordering a new drain plug! I stripped the T40 after the first fluid drain and it was a bear to get off (I ended up cramming a 6mm Allen in there and was able to break it free). An aluminum T40 bolt seems pretty silly in this application. Obviously, Ford must feel the same way! The replacement bolt was a steel 6mm Allen head. | 
