Cat, I've been waiting for someone to point this out but I guess I have to.
You ripped all that music at 640 kbps? You already posted the specs that your car player accepts a maximum of 320...
I speak from experience - an aftermarket Clarion head unit in my Subaru, and the factory unit in my new Kia. Plug in a stick with files higher than the rated bitrate and you'll get silence. Yes, I tried it.
I have about 1900 files on a 16gb stick, about 3gb free.
It's disappointing that none of the car systems seem to play wavs or flacs. But against road noise, engine noise and wind noise, adequate quality really is adequate.

I watched my copy but I can't recall.
Either way, it's a longgg movie.

Going to watch the fist disc of the 2 disc 3D version of The Hobbit tonight.

Does anyone know if each disc contains 1/2 of the movie, or is most of the movie on the 1st disk with a small portion left over on the 2nd?

I haven't seen the movie yet, btw.