I was given an audiobook from Audible.com. I was amazed that it was on just 1 CD verses the book thickness multiple CD sets that are normally sold.

I downloaded an audiobook of a similar length from a different seller and had to burn 7 CDs for the book.

So what gives? I assume that Amazon through Audible uses some sort of effective mp3 compression to fit the entire book on one CD.

I want to find a way to do this. But it needs to still be playable in the car for my commute.

Anyone have any ideas?