2 minutes in and my mind is wandering. I just can't do it. I have the same problem with talk radio, but to a lesser extent, not sure why. I can usually stay focused on something like Science Friday. But fiction? Never.
But then I don't find driving 'unproductive' in that I always have more things queued up to think about than I have time to think. I end up thinking these things rather than listening to the book. (wunky listens to audiobooks all of the time in the car, if you are confused as to why I am listening to books if I don't listen to them).
I also find it extremely annoying how slow the information intake is. Actually, I have that annoyance with normal conversation - I had a fun phone conversation today with a coworker that seemed to be the same way as me in that regard, in that we could cut each other off with "I get what you are saying". Short conversation with a lot said. I drive wunky crazy because I rarely finish a sentence - figuring that if I start it she should be able to complete it (I mean, who can't figure out what "I'm going to....." means???!?!)
So, no audiobooks for me, for the most part. That's not a claim that I'll never get drawn into one, as I can definitively get drawn into radio programs like Bob Edwards Show or This American Life, etc., but they are just so much more lively and conversational, and presenting new information that my mind seems to latch onto.
edit: I'm also one of those people that think claims that Shakespeare is meant to be watched, not read, is pure bunk. I adore reading Shakespeare, but for the most part have significant trouble following it on the stage. For the most part I find the stage version much reduced, though there are still plenty of moments of sublimity. I just take in information more easily, and can dwell and savor it better, in written form. Also, I know the words to very few songs - I don't know what most songs are actually singing about, except for the jazz standards I ended up learning while studying jazz guitar. I can hear the melody in my head, could pick it out on a piano, etc., but don't ask me about the lyrics - my mind just doesn't process things well that way.