Another Tricky Test

Completely off subject - I was looking through my bookshelves for something to read and came across "Gravity's Rainbow" by Thomas Pynchon.
According to the inside cover, I was given this for Christmas 1985. I've tried to read it a couple of times and can remember enjoying it but being defeated by it's density or possibly mine - anyway, to go with my motorcycle test challenge, I'll try again with Gravity's Rainbow. Which will be harder?