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Has anyone experimented or had any luck with audio-only study methods? I drive 7 cumulative hours almost every weekend and would love to take advantage of this uninterrupted time.

I don't know of any super serious audio study materials, but there are 67 episodes and counting of the Thinking LSAT podcast, which I enjoy and recommend. The last 20 or so show up on my podcast app, but you can download the rest from their website: http://www.thinkinglsat.com/blog/

I love them. Used all of 1L to great success (in conjunction with class etc).