As I record more and more data, my notebooks' pages get more and more crowded. I've recently added time spent in various heart rate zones, for example. That's why a pre-printed book would be handy, but I don't feel like buying a cycling journal, especially if I can't actually see it first. The Cyclist's Training Bible includes a two-page, one-week blank sample from a training journal. I'm trying to pattern my notebook entries after it.
I also like to record interesting things I saw, describe the ride (e.g. intervals), and so on. I'd need a separate journal for that, anyhow. At the very least, I'd need to insert a page where I could keep notes about what I do, let's say, for Workout A (pace), Workout B (intervals), and so on.
Oh, and keeping tabs on Le Tour! Froome is still in the yellow; Sagan is in green, and so on. Jersey holders and GC aside, here's some more interesting stuff about the Tour de France.