I have read it three times, for some reason

there's basically three strands that intertwine to form the story
1) a real-time road trip across america
2) a psychological investigation of a guy who went crazy searching for a philosophical truth
3) a fairly abstract musing on the nature of 'quality'
the first time I read it, age 17, I lapped it all up. second time, (27 ish?) I missed out a lot of the 'quality' stuff. the third time, age about 32, I basically just read the road-trip bits, the other parts really got on my tits... I think I absorbed a few of his most interesting points the first time I read it ('the Buddha resides as comfortably in a motorcycle engine as in a lotus blossom' or something like that) and after that, all the rest of that 'quality' blah just felt well, irrelevant at best.
also, I started to feel he was a bit of a git towards his son, and it irked me. you can see the other couple in the book trying to make up to the son for it, especially at the campfire scene if I recall correctly... while he once again goes off into his schpiel about quality and meaning...