Hmm, what a great question!
I'm usually a tunes guy if there people in the vehicle with me and if alone it's mood-dependant but if I had to answer I'd say 40% podcasts and 60% tunes. It also depends on the length of trip as the podcasts I like generally go for well longer than an hour.
That's true - I like the hour long ones when I do after work walks. Keeps me focussed and walking!
I've just finished a series about Anglo Saxon England. Would probably bore people to death but I love it. I also listen to Jocko Podcast religiously. There's others as well.